Brush Research BC12240AO FLEX-HONE®, 1/2" (12.7mm) Diameter, 240 Grit, Aluminum Oxide, For Aluminum, Brass, Bronze and Softer Non-Ferrous Materials

It done a really great job honing my chainsaw cylinder. Good product.

Works as described for deglazing cylinders

These little tools are pricey for a one time use, but "right tool for the job" so worth the cost.Works really great. I used a drill press and hand-held the cylinder I was honing with heavy gloves on.

My Dad seized his Echo CS-400 chainsaw a while back. I took the junk parts, drove the piston out of the cylinder and examined it. Didnt look great, but not terrible either. Bunch of rust, two opposing minor grooves but no major scoring. Bought a new piston kit. Re-habbed the cylinder with this flex hone. They really work well to clean it up and then cross-hatch the cylinder so the new piston ring will seat properly. RPM recommendations are set by the manufacturer depending on cylinder diameter. Follow those. Also, don't forget to always use this well lubed with motor oil and clean the heck out of the cylinder with warm soapy water (and all the ports and channels in the cylinder too). Once you think it's clean and dry, rub a soft white cloth on the inside of the cylinder walls and its likely you'll see its not clean enough. Do it again. This cylinder head was aluminum, so I chose the AO (aluminum oxide) grit. They have other grits for different metals.Chainsaw's running like a champ now! Good compression. It's like brand new. Only reason it's not 5 stars is they're kind of pricey for, essentially, grit-on-a-stick.

Quality hone! As expected and described

I uploaded a before/after picture. I’ll let that speak for itself.Also, this works wonders on nikasil without removing the material. Borer size is identical before and after honing. Do it!

Item was as advertised, good quality and arrived on time!

Did an awesome job!!!! Thanks

Zero issues, will be buying other sizes.