--- product_id: 357338518 title: "Flex-Hone Brush Research Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2\" (89 mm) Diameter, 240 Grit Size" brand: "flex-hone" price: "€ 155.35" currency: EUR in_stock: true reviews_count: 5 category: "Flex Hone" url: https://www.desertcart.hr/products/357338518-flex-hone-brush-research-cylinder-hone-gb-series-silicon-carbide store_origin: HR region: Croatia --- # 240 grit silicon carbide for precision finish 3.5" diameter for versatile fit Made in USA for trusted quality Flex-Hone Brush Research Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 240 Grit Size **Brand:** flex-hone **Price:** € 155.35 **Availability:** ✅ In Stock ## Summary > 🔩 Elevate your metal finishing game with the original Flex-Hone — where precision meets effortless perfection! ## Quick Answers - **What is this?** Flex-Hone Brush Research Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 240 Grit Size by flex-hone - **How much does it cost?** € 155.35 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/357338518-flex-hone-brush-research-cylinder-hone-gb-series-silicon-carbide) ## Best For - flex-hone enthusiasts ## Why This Product - Trusted flex-hone brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Universal Compatibility:** Works seamlessly with hand drills, drill presses, and CNC machines—no special setup needed. - • **Precision Plateau Finish:** Achieve a flawless 24-32 Microinch surface for superior oil retention and seal longevity. - • **All-in-One Deburring & Finishing:** Simultaneously deburr crossholes and finish cylinders in a single setup—boosting efficiency. - • **Durable Silicon Carbide Abrasive:** Engineered for mild steel, stainless steel, cast iron, and softer ferrous metals with consistent results. - • **Self-Centering & Wear-Compensating:** Innovative design ensures perfect alignment and extended tool life without extra training. ## Overview The Flex-Hone GB Series is a 3.5-inch diameter silicon carbide abrasive brush designed for precision plateau honing and deburring of ferrous metals. Made in the USA, it delivers a consistent 240 grit finish that enhances oil retention, seal performance, and surface longevity. Compatible with various rotating spindles, it offers a self-centering, self-aligning design that simplifies setup and maximizes efficiency across automotive, industrial, and precision applications. ## Description The FLEX-HONE tool was originally created by Brush Research Manufacturing to deglaze cylinder walls in automotive applications. Brush Research embraced the benefits of a plateau finish and pioneered the concept of plateau honing culminating in the introduction of the FLEX-HONE tool in 1972. The FLEX-HONE has gained many nicknames over the years and including ball hone, ball style hone, flexihone, dingleberry hone, bead brush, glaze breaker and glaze buster. Flexible honing with the FLEX-HONE tool produces an oil holding cross hatch pattern and a true plateau finish free of cut, torn and folded metal. Any type or size of cylinder can benefit from the FLEX-HONE. These abrasive bead style brushes are produced in standard diameters from 4mm to 36 inches. Nine abrasive types are offered including silicon carbide, aluminum oxide, boron carbide and diamond allowing the tool to be tailored to finish any base material. A choice of 11 different grit selections are available for precise control of finish parameters. The elimination of peaks results in rapid ring seating, better oil control, reduced seepage in hydraulic and pneumatic applications and provides better seal performance and longer seal life. Successful applications include firearm chambers, shotgun barrels, musical instruments, combustion chambers, air compressors, pumps, valve bodies, valve guides, brake cylinders, wheel cylinders and the list goes on and on. FLEX-HONE tools are also very effective for deburring cross drilled holes, port radiusing and edge blending. Because of its unique construction, the FLEX-HONE is self-centering, self-aligning, and self-compensating for wear so it does not require an elaborate set-up or special training. Deburring can be effectively automated and combined in the machining process to allow a complete cylinder finish in one operation or it can be employed as a secondary operation with equal results. Review: Worked well Review: Quick ship and decent quality. ## Features - [QUALITY]-Proudly Made in the USA. Quality and consistency you can count on made from the inventors and makers of the tool. - [CROSSHOLE DEBURRING]-Accomplish finishing and deburring simultaneously in a single setup. Can be used in virtually any rotating spindle from a hand drill, drill press or CNC equipment. - [240 GRIT SILICON CARBIDE ABRASIVE]-Excellent on mild steel, stainless steel, cast iron and other softer ferrous materials. Typically achieves a finish of 24 - 32 Microinch (.6 - .8 Micrometer). ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B002XUL1EE | | Brand Name | Flex-Hone | | Bristle Type | Crimped Wire | | Compatible Material | Metal | | Customer Reviews | 4.8 4.8 out of 5 stars (382) | | Grit Material Type | Silicon Carbide | | Grit Type | Medium | | Item Dimensions | 34.3 x 13 x 13 centimeters | | Item Dimensions L x W | 34.3L x 13W centimeters | | Item Weight | 308 g | | Manufacturer | Brush Research Mfg. | | Material Type | Silicon Carbide | | Number of Pieces | 1 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** Flex-Hone - **Bristle type:** Crimped Wire - **Grit material:** Silicon Carbide - **Material:** Silicon Carbide - **Product dimensions:** 34.3L x 13W centimeters ## Images ![Flex-Hone Brush Research Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 240 Grit Size - Image 1](https://m.media-amazon.com/images/I/61f9Ueb7-8L.jpg) ## Questions & Answers **Q: Wish one is best for a cylinder wall that is 75mm (2.95 inch) ?** A: For the cylinder wall bore size of 2.95", the 3" Flex-Hone is the correct choice., Enter this ASIN # B002N3AA2A in the Amazon search bar for the correct hone. **Q: Hello, my cylinder bore is 3 1/8" what size tool do i need to purchase thank you.** A: For a 3.125" bore, your application will require the 3-1/4" (3.250") diameter Flex-hone. The 3-1/4" will work perfectly in the 3-1/8" bore as the 3-1/4" Flex-hones working range is down to 3.000". Thank you for the inquiry. **Q: Can i use this to hone out an old cast iron pipe? it's about 3 3/4" now and i want it at 4" id. thanks** A: This hone is not coarse enough to remove that much material. It would take forever and the hone would wear out first. You would need a lathe to remove that amount of thickness. **Q: I see that it says tool is oversized. For a cylinder bore of 3.66, should I be getting the 3.75 or the 3.50 model?** A: 1I bought a 4.50 and used it on a 3.55 bore with no problem I didn't hone as much as instruction said for large bore, hatch marks were beautiful so go bigger and you can use it over a broad area of bores. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by J***M on 23 November 2025* Worked well ### ⭐⭐⭐⭐⭐ Review *by J***H on 30 August 2019* Quick ship and decent quality. ### ⭐⭐⭐⭐ Review *by D***Y on 19 January 2026* Excellent product ## Frequently Bought Together - Brush Research GB31224 FLEX-HONE®, 3-1/2" (89mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials - Brush Research FHQ FLEX-HONE® Oil, Specially Formulated Honing Oil, 1 Quart Bottle (32 fl oz) - Permatex 81950 Ultra Slick Engine Assembly Lube, 4 oz. , Red --- ## 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/357338518-flex-hone-brush-research-cylinder-hone-gb-series-silicon-carbide](https://www.desertcart.hr/products/357338518-flex-hone-brush-research-cylinder-hone-gb-series-silicon-carbide) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-10-17*