Chainsaw grinding wheel most popular material is pink aluminum oxide, vitrified bond. Forturetools produce this type Grinding Wheel Disc for Chainsaw Sharpener, this kind of grinding wheel is widely used with Electric Power Tools chainsaw sharpener to maintain the edge of the saw chain teeth. Match with chainsaw grinder. Most often used size is 4-1/8 inch and 5-3/4, bore is 7/8 inch and 1-1/4 inch. Grain size chooses 60# or 80#. Pink aluminum oxide abrasive grain is taken as the best option for this usage.