PFERD disk set. It stands out for its high performance and is designed for variable speed angle grinders. The set features fiber, non-woven, felt discs in 4-1/2“ diameter and 5/8-11” thread size that are excellent for rough grinding, surface preparation, pre-polishing and polishing to a high gloss. The unique geometry of the cooling grooves provides high air flow, which greatly reduces heat stress on the abrasive and workpiece. It also features a specially designed support disk and a robust mounting system on the back of the tool for quick and easy disk replacement.