If you don't own an angle grinder, these fiber discs paired with a drill-mount arbor (53376, sold separately) will do the trick and also save you some money. They feature a tool-free, twist-on/twist-off fastening system that makes fast work of disc changes and maximizes productivity. Even if you already own an angle grinder, you'll enjoy the small diameter of these discs when working in tight spaces. Ideal for weld grinding and other metal removal tasks Features a plastic twist-on fastener equivalent to the 3M™ Roloc™ fastening system Use with Drill-Mount Backup Pad (1/4'' arbor) 53376, sold separatelyNorton