GP12012 PSA Self Stick Backing Pad, M6 thread with drill attachment/Sanding, Polishing Backer / 3 inch Diameter : 3 inch / 75mm Thread Size: M6 (comes with universal drill attachment) Density : Soft Flexible 10mm Foam Interface: PSA Self-Stick (Self-Adhesive) Max RPM: 2500 Recommended for Spot repairs, low speed sanding or polishing, curved or flat surfaces (Glass, Plastic, Acrylic, Stainless Steel)