3" diameter felt wheel with 1 1/2" thickness and 1/4" arbor hole. Can be used on any metal for polishing. Made of 100% Wool. Highest quality felt. 100% wool felt wheels provide the perfect home for aggressive abrasive polishing compounds as well as the finest grains available to give surface finishes from smooth to mirror brilliance. Every wheel is perfectly balanced to give vibration free, true running performance.