Pack contains 2 x 40-Grit discs (for more aggressive stock removal) and 1 x 80-Grit disc (for finishing and lighter stock removal).| Ideal to use for cleaning weld seams, descaling metal and rust removal.| Great for smaller jobs on most metals.| Fantastic for those who like to work with reclaimed or pallet wood by removing large surface areas quickly and easily.| Far more cost-effective than regular velcro sanding discs.