Supercrazy Disc Brake Piston Caliper Pad Spreader Tool SF0004 Helps to push the brake caliper piston back squarely with no damage to the piston face. Can be used with a 1/2" socket drive e.g. on a 1/2" ratchet or power bar etc? Capacity from 0 - 2 1/2" (0 - 65mm) Suitable for most ATE / Bendix / Delco / Brembe and Girling calipers.Capacity from 0 - 2 1/2" (0 - 65mm)