8 dust collection holes. High-density and uniform hook provide strong stickness and a long service life. The 5inch hook-&-loop pad is the direct replacement for pad part DWE6423 and N329079, working with models DWE6423/6423K, DWE6421/6421K, DCW210B random orbital sander. Product name: Sander Backing Pads Type: 5 inch 8 dust collection holes Size: 125mm/5inch Colour:black+blue Material:PU Package Contents: 3 x Backing Pad Note: There is a slight colour difference in the physical product, please don't mind Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.