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🛠️ Elevate your engine rebuilds with the ultimate self-aligning honing powerhouse!
The Brush Research GBD33424 FLEX-HONE® is a 3.75-inch diameter, 240 grit silicon carbide honing tool designed for mild steel, stainless steel, cast iron, and softer ferrous materials. Its engineered oversized, self-centering design ensures optimal pressure and alignment for a precise plateau finish with an oil-retentive crosshatch pattern. Ideal for hydraulic, pneumatic, and engine cylinders, it simultaneously deburrs and finishes in one step, compatible with hand drills, drill presses, and CNC equipment. Proudly made in the USA by the original inventors, it delivers consistent, professional-grade results that improve seal life and reduce maintenance downtime.
| ASIN | B002XUL1LC |
| Best Sellers Rank | #14,805 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Flex Hones |
| Brand | Flex-Hone |
| Brand Name | Flex-Hone |
| Bristle Type | Abrasive Globule Bonded To Flexible Nylon Filament |
| Compatible Material | Cast Iron, Mild Steel, Other Softer Ferrous Materials, Stainless Steel |
| Customer Reviews | 4.7 out of 5 stars 668 Reviews |
| Grit Material | Silicon Carbide |
| Grit Material Type | Silicon Carbide |
| Grit Number | 240 |
| Grit Type | Fine |
| Included Components | GBD 3-3/4" (95MM) 240SC FLEX-HONE |
| Item Diameter | 3.75 Inches |
| Item Dimensions | 3.74 x 3.74 x 0.04 inches |
| Item Weight | 1 Pounds |
| Manufacturer | Brush Research Manufacturing |
| Material | Silicon Carbide |
| Material Type | Silicon Carbide |
| Model | GBD33424 |
| Number of Items | 1 |
| Number of Pieces | 1 |
| Part Number | GBD33424 |
| UPC | 843469149404 |
| Unit Count | 1.0 Count |
| Warranty Description | Manufacturer Warranty |
S**H
A Must-Have for Any Engine Builder
I recently used the Brush Research GBD40024 FLEX-HONE® (4”) while freshening up the cylinders on a small block Chevy 350, and I’ve got to say—this tool impressed me. Right out of the box, it felt solid and well-made. I chucked it into a cordless drill, added some honing oil, and gave each bore about 5–10 seconds of low-speed rotation. The crosshatch pattern it left was textbook perfect—clean, consistent, and exactly what you want before dropping in new rings. What I really appreciated was how forgiving it is, even if you’re not a pro machinist. It centers itself well and doesn’t gouge or chatter. It’s one of those tools that gives you great results without needing a bunch of setup or precision tooling. One heads-up: it’s not cheap, but the quality and time it saves make it absolutely worth the price. If you’re rebuilding an engine or refreshing an old bore, this hone is a no-brainer.
J**.
6.7 Cummins Hone
Quality product from a quality company. No one local to me sold them so I had to source it from Amazon. As always, it shipped quickly. The hone did its job and was the correct size and grit for a 6.7 Cummins bore. According to the chart, it should work with a 5.9 as well. Knowing what i know now, the balls have a lot of give to them so going 1/4-1/2 inch over would probably merit the same result. Money well spent on the job its intended to be used on.
C**S
Tighten up the drill
Works like a champ
V**O
Best in the game.
Work as intended. Flex-hone is best in business for this products for many many years. I suggest pairing this purchase with their flex-hone lubricant for the perfect finish and ease to use. The size was perfect for my 81.5mm cylinders.
J**.
Hone is smaller than i am needing
Was not a 4.5" bead hone. Measured by hone measurements and its smaller than a 4" Bead hone by hone measurements. Returned to amazon
S**S
Works Great!
Works great. Excellent instructions, too.
K**K
Great hone
Works good. Used on a 07 chevy 5.3L flawless & good quality
D**X
Great
Worked great
A**R
Worked like a charm....
It was delivered promptly and worked very well.
M**7
A must have for engine builders
Amazing glaze buster. Super finish, very happy
J**M
Works well
Works well
R**D
Awesome hone
Worked great for my 455 olds that was bored 0.30 over. Good quality item. Would buy again.
P**L
Good tool to have
am a believer! Almost machine shop quality hone, but done at home
Trustpilot
2 weeks ago
1 day ago