Mirka 105G - 5" Grip Faced Backup Pad (Qty 1) Features: 5" (150mm) in diameter grip faced backup pad Medium density foam pad 5/16 x 24 threaded attachment The Mirka backing pads for sanding machines are designed to meet the challenges set when performing demanding sanding operations. Mirka has developed backing pads for both sanding with traditional abrasives and for sanding dust-free with Mirka's Net Sanding dust extraction system. In order to achieve the best performance and a good sanding result, it is important to combine the right sander with the right accessories. Browse our backing pads and find the backing pads suitable for your sanders.