Hookit Back-up pad allows for easy attachment, quick removal and accurate centering of single sided compounding or polishes pads. Enables users to attach pads without having to remove the 3M Adaptor, 05710. 3M Perfect-It Back-up Pad addresses the need for auto body shops to achieve professional-level results while boosting overall shop productivity. The back-up pad delivers on multiple counts including providing a quick-change advantage and producing exceptional finishes on today's automotive paints. The pad provides a secure, no-slip attachment, yet allows for easy removal of abrasive discs when necessary. Use this pad for producing professional quality finishes on gelcoat and paints. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.