Features:1. 8-hole design on each pad prevents dust from clogging sander machine allowing easy cleaning to prolong tool life. Suitable for uneven surface polishing such as wooden bowls, protection against hurt to backing pad.2. Hook and Loop backing can be replaced quickly and easily, has strong bonding ability. One side is HOOK face, can stick with H&L sanding discs, another side is LOOP face, can stick on H&L sanding pad.3. The interface pad is constructed of soft durable sponge which allows the technician to follow contours and get closer to edges while minimizing. Suitable for uneven surface polishing such as wooden bowls. Protect against hurt to backing pad.4. Fit for 5 inch hook & loop sanding discs and sanding pad. Suitable for uneven surface polishing such as wooden bowls, protection against hurt to backing pad, convenient replacement.Specifications:Material: SpongeOuter Diameter: 127mm / 5inchPad Thickness: 12mm / 0.47inchPackage Content:1 x Sponge Interface Pad