Having a sharp chainsaw blade improves its performance and safety. Dremel's high-quality Chainsaw Sharpening stones can quickly and easily keep your chains, gardening tools, and other tools blades sharp and ready for use. The 455 (Pink) Chainsaw Sharpening Stone can be used for 7/32"pitch chain sizes. Working diameter: 7/32: (5.6 mm), Shank: 1/8" (3.2 mm), Material: Aluminum Oxide Use with the Dremel A679 Chainsaw Sharpener attachment is recommended. Compatible with 3/8 In. pitch chainsaws Dremel accessories are also color-coded into usage categories, to find more Grinding & Sharpening accessories look for the Green color code. Do not run in excess of 35,000 RPM