Chain Sharp Dual Sharpening Tool, For Use With Low Profile 3/8 Inch Chain, 17050 One step chainsaw sharpening tool Sharpens both the round part of the tooth and the flat depth gauge area Complete with 8 inch round chain saw file and depth gauge file File diameter of 5/32, and meant for use with a 3/8 inch (low profile) chain size Observe the instructions of the chain manufacturer