High Edge Stability Disc Compact design is great for those small and hard to reach places Highly durable rubber gives you the rigidness when you want it and flexibility when you need it Superior Pads and Abrasives SPD03 3" Twist-on and off quick change locking spindle. Makes disc changing of different grits easy and maximizes productivity and minimizes down time. Offers smooth grinding of weld seams & joints in hard to reach areas, ideally suited for use with die grinders.