Brush Research GBD51224 FLEX-HONE®, 5-1/2" (140mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials

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.

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.

These are the best hones money can buy just use them correctly and they will give you great results. I have been using this brand for over 20 years.

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.

Works great very durable I would recommend it, and I would purchase again.

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

Worked great! Would order again

Works great. Excellent instructions, too.

great tool

Used on my LS and worked great!

It was delivered promptly and worked very well.

Works well

En verdad cubre las espectativas que tenía del producto.