Brand Name: Nicholson | File Type: Round | Handle Included: No | Length: 8 in. | Material: High Carbon Steel | Number in Package: 3 pc. | Packaging Type: Bagged | Pattern: American | Width: 3/16 in. The Crescent Nicholson round knurl-cut chainsaw file with a set of 3 round chainsaw files is perfect for more aggressive sharpening. Proper chainsaw sharpening procedure is important; first, secure the chain with adequate tension to hold the cutters in place during filing. Then, file from the inside of the cutter to the outside, doing first the left-hand cutters and then the right-hand. Sharpen the teeth of your chainsaw's chain at an angle between 20Â ° and 45Â ° degrees. | American pattern, round chainsaw file for sharpening the teeth of any chainsaw blade | Tighten tension on the chainsaw's chain to firmly support cutting edge for filing | File from the inside to the outside of the cutter | Place file against beveled cutting surface of teeth at an angle of 20Â ° to 45Â ° 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 | We recommend that you check the depth gauge height every 2 or 3 sharpening's | "Height between cutting teeth and depth gauge ranges between .020" to .030"" | Round shaped file with a knurled cut for more aggressive sharpening