The flexible Backer Pads are hook and loop backed and will accept Ceramica, Sandpaper and Felt Wheels. Extremely flexible, these backer pads are ideally suited for tough contours and inside curves, allowing the user to get in tight corners with ease. Available in 2 in, 3 in, 4 in, and 5 in versions, these pads come with the standard 5/8 in-11 thread, commonly seen on most of the polishing tools in use today.