3M 7100168693 Back-up Pad is a black, round pad suitable for various industries such as AOEM, aerospace, automotive, marine, rail, and woodworking. With a maximum speed of 10000 rpm and a medium density rating, it offers efficient performance for applications like finish prep/repair and paint finishing. This pad has a PSA attachment type and an overall thickness of 0.31 inches (7.87 mm). It is compatible with rotary buffer machines and provides sanding for both wet and dry surfaces. Perfect for cabinetry, custom woodworking, and millwork projects.