4 to 4-1/8, 105mm, 120SC, (Grit) Standard duty Flex-Hones for Block Cylinders (13 1/2OAL)...You are bidding on a Brand NewBRM Standard Duty Flex-Hone part number GB41812. This hone is for a 4 - 4.125 inch bore and has a 120 Grit. This is for honing a block for cast rings. These hones are self-centering, self-aligning and self-compensating, for wear, unbreakable honing device with long life and consistant finish.Made in U.S.A