--- product_id: 500431761 title: "Rock Tumbler Grit Kit Refill for 6lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers" brand: "mjr tumblers" price: "€ 63.83" currency: EUR in_stock: true reviews_count: 13 category: "Mjr Tumblers" url: https://www.desertcart.hr/products/500431761-rock-tumbler-grit-kit-refill-for-6lb-tumblers-4-step store_origin: HR region: Croatia --- # compatible with rotary & vibratory tumblers 4-stage precision grit system USA veteran-owned quality brand Rock Tumbler Grit Kit Refill for 6lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers **Brand:** mjr tumblers **Price:** € 63.83 **Availability:** ✅ In Stock ## Summary > ✨ Polish Like a Pro, Shine Like a Star! ✨ ## Quick Answers - **What is this?** Rock Tumbler Grit Kit Refill for 6lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers by mjr tumblers - **How much does it cost?** € 63.83 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/500431761-rock-tumbler-grit-kit-refill-for-6lb-tumblers-4-step) ## Best For - mjr tumblers enthusiasts ## Why This Product - Trusted mjr tumblers brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Universal Compatibility:** Seamlessly works with both rotary and vibratory tumblers for versatile polishing - • **STEM-Ready & Educational:** Ideal for professionals and educators teaching geology and hands-on science - • **Flawless 4-Stage Polishing:** From rough to mirror-smooth with coarse to ultra-fine 12,000 grit polish - • **Pre-Measured for Effortless Use:** Perfectly portioned for 6lb tumblers—no guesswork, just results - • **Veteran-Owned Quality Assurance:** Crafted by a USA-based disabled veteran-owned company committed to excellence ## Overview This Rock Tumbler Grit Kit Refill offers a complete 4-step silicon carbide and ultra-fine 12,000 grit aluminum oxide polishing system, pre-measured for 6lb tumblers. Compatible with rotary and vibratory models, it’s designed by a USA veteran-owned brand to deliver consistent, professional-grade stone polishing results with ease—perfect for hobbyists, educators, and geology enthusiasts aiming for flawless, museum-quality finishes. ## Description Product description Review: This is TRUE GRIT! - This is simply some of the best quality tumbler grit I have used. If you do the first three stages properly, then the 12,000 girt polish will be perfect. All in all this is good, works well in each stage, easy to use. the only thing that might make it better would be to package it in bottles instead of bags, but honestly, that's about it. Review: Passion-fueled and high quality - This grit and polish set is exceptional. You can tell it was crafted by people who genuinely care — not just about rocks, but about the process and purpose. This company emanates expertise and enthusiasm, and that shows in the results. My rocks came out more beautiful than ever and I would prefer to buy only from these rock guys. The picture is of some rocks from my apartment landscaping after the process . The instructions are detailed but easy to follow. It’s not your typical instruction manual, rather a sincere document created by the seller from the heart (their tips and tricks included!). It’s really unique and special. I’ve been using a “gimmicky” tumbler set for my HS STEM program and at home with my kids. As a teacher, is a great tool for many lessons and even many subjects. ## Features - COMPLETE 4-STAGE ROCK POLISHING SYSTEM: This refill grit kit includes all four essential stages of rock tumbling—coarse (60/90), fine (120/220), pre-polish (400/600), and ultra-fine 12,000 grit aluminum oxide polish. Designed to guide stones from rough surfaces to a smooth, polished finish. - 12,000 GRIT ULTRA-FINE POLISH FOR FINAL FINISH: The included sub-micron aluminum oxide polish is designed for the final stage, helping bring out a smooth, refined surface. Ideal for achieving a clean and polished appearance after shaping and smoothing stages - PRE-MEASURED FOR 6LB TUMBLERS – EASY TO USE: Each stage is pre-measured specifically for 6lb rock tumblers, simplifying the polishing process. Just add the contents at each stage and let the tumbler do the work—no complicated measuring required - COMPATIBLE WITH ROTARY & VIBRATORY TUMBLERS: Works with most rock tumblers, including rotary and vibratory models. A versatile grit refill option for maintaining your polishing workflow or restocking supplies. - USA OWNED BRAND WITH QUALITY MATERIALS: Offered by a USA-based, disabled and veteran-owned company. MJR Tumblers provides reliable rock tumbling supplies designed for consistent performance and ease of use. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07F1FCPZH | | Age Range Description | 7 to 100 | | Brand Name | MJR Tumblers | | Color | Grey | | Customer Reviews | 4.5 out of 5 stars 1,268 Reviews | | Educational Objective | Teach children about geology and the process of tumbling and polishing rocks | | Is Assembly Required | No | | Item Weight | 18 Ounces | | Manufacturer | MJR Tumblers | | Manufacturer Maximum Age (MONTHS) | 120 | | Manufacturer Minimum Age (MONTHS) | 8.0 | | Manufacturer Part Number | MJR6pgk | | Material Type | Aluminum Oxide, Plastic Pellets, Silicon Carbide | | Operation Mode | Manual | | Power Source | Hand-powered | | Set Name | 6 lb Tumbler Kit | | Size | for 6lb barrel | | Supported Battery Types | No batteries required | | Theme | Geology | | Unit Count | 1.0 Count | ## Product Details - **Material:** Silicon Carbide, Aluminum Oxide - **Grit Material:** Silicon Carbide, Aluminum Oxide - **Item dimensions L x W x H:** 8 x 6 x 2.25 inches - **Brand:** MJR Tumblers - **Grit Type:** Coarse, Fine, Ultra Fine ## Images ![Rock Tumbler Grit Kit Refill for 6lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers - Image 1](https://m.media-amazon.com/images/I/61aeQRPy1vL.jpg) ![Rock Tumbler Grit Kit Refill for 6lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers - Image 2](https://m.media-amazon.com/images/I/71SVNiXuCwL.jpg) ![Rock Tumbler Grit Kit Refill for 6lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers - Image 3](https://m.media-amazon.com/images/I/71ENSH8w-mL.jpg) ![Rock Tumbler Grit Kit Refill for 6lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers - Image 4](https://m.media-amazon.com/images/I/61mhoieNFpL.jpg) ![Rock Tumbler Grit Kit Refill for 6lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers - Image 5](https://m.media-amazon.com/images/I/71u-VNXNY6L.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ This is TRUE GRIT! *by J***E on December 15, 2025* This is simply some of the best quality tumbler grit I have used. If you do the first three stages properly, then the 12,000 girt polish will be perfect. All in all this is good, works well in each stage, easy to use. the only thing that might make it better would be to package it in bottles instead of bags, but honestly, that's about it. ### ⭐⭐⭐⭐⭐ Passion-fueled and high quality *by K***A on July 11, 2025* This grit and polish set is exceptional. You can tell it was crafted by people who genuinely care — not just about rocks, but about the process and purpose. This company emanates expertise and enthusiasm, and that shows in the results. My rocks came out more beautiful than ever and I would prefer to buy only from these rock guys. The picture is of some rocks from my apartment landscaping after the process . The instructions are detailed but easy to follow. It’s not your typical instruction manual, rather a sincere document created by the seller from the heart (their tips and tricks included!). It’s really unique and special. I’ve been using a “gimmicky” tumbler set for my HS STEM program and at home with my kids. As a teacher, is a great tool for many lessons and even many subjects. ### ⭐⭐⭐⭐⭐ Works well *by L***E on March 26, 2026* Good product ## Frequently Bought Together - MJR Tumblers Refill Grit Kit for 25 LB Rock Tumblers Silicon Carbide Aluminum Oxide Media Polish - Hiceeden 8 Pounds Rock Tumbling Filler Media, 1/5" x 2/5" Reusable Cylinder Ceramic Pellets Non-Abrasive for Rock Tumbler, Stone Polisher --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/500431761-rock-tumbler-grit-kit-refill-for-6lb-tumblers-4-step](https://www.desertcart.hr/products/500431761-rock-tumbler-grit-kit-refill-for-6lb-tumblers-4-step) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-06-23*