Cross and square pads are used with rotary hand tools for grinding, deburring, and blending difficult-to-sand areas. Square pads are used for grinding and blending of channels and corners, while cross pads are designed for deburring and polishing the interior walls of pipes and tubes. Common abrasive materials include aluminum oxide and ceramic. Choose from coarse to very fine grade, or corresponding grit, depending on material being worked and level of precision required. Use with cross/square pad threaded mandrels, sold separately.