This is a foam pad with attachment fabric intended to firmly hold Trizact™ Diamond Pads for extended periods of time through multiple use cycles. It allows for easy attachment of Trizact pads and firmly holds the pads in place. Does not clog or require frequent cleaning like floor pads. It has significantly longer life; one backer pad replaces multiple floor pads. Use for grinding and polishing. For use with a 175-600rpm floor machine.