3M™ Roloc™ Shank allows 3M™ Roloc™ Disc Pads to fit a collet on a die grinder or disc sander, or a drill chuck on a drill. The 1/4 in (0.64 cm) external threads fit 3M™ Roloc™ Disc Pads with 1/4-20 internal threads.3M Roloc Shank enables you to secure a 3M Roloc Backup Pad to a die grinder or disc sander, adding versatility to tools you may already own.The short, 2 in (5.08 cm) shaft of the 3M Roloc Shank keeps the abrasive closer to the tool, resulting in less vibration and more precise operator control.