Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 4-1/8 (105 mm) Diameter, 240 Grit Size

Works great. Produces a very good finish without cutting. Great tool if your cylinders are in good shape. I had to use a 3 stone hone to cut a little out of my cylinders and used this tool to get a good final finish after cutting. A+

Used to clean surface rust from the inside of the stick cylinder on a case 580c. The rust was light so I needed a home that would not cut in to much and leave the bore rough. I used a 240 grit 4-1/8” diameter hone. The finish was not that rough but I probably should have moved up to the 320 grit.

Works to re-hone a cylinder by yourself if you dont want or cant take the block to the machine shop, wich, of course, would be the only proper way to rebuild an engine. I had an engine that was seized from rust in one of the cylinders and this hone was able to clean it up enough to put this thing back on the road. it didnt remove the rust pitting but it made it smooth enough so I couldnt feel it with my fingernail.

I am no expert on cylinder homing, but had no issue using this hone. It worked as expected and my cylinders are now honed. Just a few seconds per cylinder and the job was done. I only needed it for 2 cylinders so I dont know how durable it is, but it seems like it is good quality to me.

Ive only done one practice engine with this hone so far, but none of the balls came loose like others have mentioned, and it is true to size so that = 5 stars from me. I had to plunge in and out of the cylinders fairly quickly when using a 400RPM drill to get a 45 degree cross hatch, but that seems common to this type of hone. Ill update this review when I complete the engine I actually bought it to use on.

These guys make the best hones I have used over 30 years. If you use this hone correctly you can bore a cylinder out 10,000ths top to bottom evenly for 10 over pistons and rings. I do this in a variable speed drill but it can be done in a drill press too. You must check all points in the cylinder often, cleaning as you go. Use a coarse hone to get most of it then change to a hone grit specified by your piston and ring manufacturers. Clean the cylinder and oil it testing with the piston for clearance. Use your micrometer til you reach spec so you dont get your piston stuck in the cylinder. Dont Rush!! Watch a cylinder honing machine on you-tube to understand the motion you must use to keep the honing even. Always use a quality honing oil.

Item worked as advertised. Provided quality hone in my cylinders.

Needed to buy this when I was rebuilding my motor for my 3000gt. Worked beautifully. Crossed hatched nicely and will buy another when it is time to rebuild the motor in my truck and my motorcycle.

If your looking at buying it, then you know what it does. I hope your engine livesca long, happy life.

I used this hone on a 2.4l Volvo block to deglaze and put new cross hatching in the cylinders. This hone works amazing and was worth every penny. I was very nervous about doing this myself but after the first one I was comfortable with it. I used a Dewalt 20v drill on high and ran it up and down multile times for 2 passes using ATF as lubricant. The before and after speaks for itself. This thing works great.