This Oregon chainsaw file guide helps to keep the file at the correct depth, making it easy to hand-sharpen a chainsaw chain. 3/16in. File dia. Diameter in. 3/16, Dimensions L x w x H in. 12 x 3 1/2 x 1 1/4, product type file guide, product weight Lbs. 0. 37, works with Oregon 0. 325 in. Pitch saw chain. File guide grips the file securely for easy hand-sharpening of saw chains lines on the Guide's frame make it easy to align the file consistently & correctly keeps the file at the correct depth for optimum sharpening works with 0. 325in. Pitch chainsaw chains