Experience precision sharpening with the Knurl Cut Chainsaw File. This 8" file, crafted from high carbon steel, is designed to help you achieve the perfect tension on chainsaw chains, thus firmly supporting the cutters when filing. With a 20-45 degree angle against the beveled cutting surfaces of the teeth, this file follows saw manufacturer specifications to sharpen all left and right hand cutters. It is essential to check the depth gauge height every 2-3 sharpenings, and the optimal height between the cutting teeth and depth gauge is between 0.02-0.03 inches. This product comes in a carded package.