Sharpens 1000"s of chains * Preshaped and hold their shape, have an aluminum core to run cooler, create virtually no dust * Perfect for both the professional chain sharpener and the weekend sharpener * 5-3/4" diameter (D) with a 7/8" arbor hole (H), 1/8" thick (T) for 1/4 and .325 pitch chains * Fit the Oregon 511A, Maxx, Tecomec, Northern, Timber Tuff, Carlton, Speed Sharp, and other equivalent machines