The Models 504/505/508 are orbital sanders with a 3/32″ offset. The smaller rectangular orbit allows better sanding access for bumpers, recessed areas, and new panel prep. Both sanders use standard 2 3/4″ velcro sandpaper rolls. Velcro pads securely hold scuff pads for easy new-panel prep. Built-in pad release feature. Models 504 2 ¾” x 4″ Velcro Pad Models 505 2 ¾” x 5 ½” Velcro Pad.  Models 508 2 ¾” x 8″ Velcro Pad