Dura-Gold Pro Series 3" Hook & Loop DA Backing Plate Pad - Flexible Dual-Action Random Orbital Sander Polisher Pad, 5/16", Sandpaper Sanding PolishingA Pack of 2 Dura Gold Pro Series 3" Hook & Loop DA Sander or Polisher Backing Plate Pads. A high performance well balanced long lasting dual action random orbital sander or polisher backing plate pad with 10mm thick medium density, durable polyurethane foam construction, and a flexible low profile beveled edge. The pads spindle thread size is 5 16" 24, which is the universal standard thread size used by almost all brands of dual action sanders and