Oregon 5/32 in. Round Saw Chain Files (2-Pack), for sharpening 3/8 in. low profile and 1/4 in. pitch saw chain in the Chainsaw Accessories department at Lowes.com
Oregon Chainsaw File Guide, Includes 5/32 in. Round Saw Chain File, for 3/8 in. low profile and 1/4 in. pitch saw chain 25894 25894-21 - The Home Depot