Crescent Nicholson 01590 Chainsaw File, Knurl Cut, 1/8 in Dia x 6 in L Dimensions, Round

Straight tang. File from inside to outside of cutter. Place file against beveled cutting surface of teeth 20 deg to 45 deg with saw. Sharpen all left hand cutters on one side of chain then move to the other side and file all the right hand cutters. Height between cutting teeth and depth gauge is between 0.020 to 0.030 in.