Chainsaw files round smooth 8 inches length - carded dia. 3/16 inch Straight tang. File from inside to outside of cutter. Place file against bevelled cutting surface of teeth 20 degrees to 45 degrees with saw. Sharpen all left hand cutters on one side of chain then move to the other side and file all the right hand cutter s. Height between cutting teeth and depth gauge is between.020 inches to.030 inches.