Powerbuilt 648410 Disc Brake Piston Tool For use with a 3/8" Drive ratchet or drive tool Cube rotates and depresses caliper pistons back into caliper when changing brake pads Doesn't affect parking Brake setting Unique Cube design provides 5 drive pin configurations to fit most applications Chrome plated for durability For rear disc brakes on vehicles where an automatic adjusting parking brake mechanism is part of the disc brake caliper Tool provides 5 unique bit configurations to engage the caliper piston Rotates piston back into the cylinder bore to allow installation of new brake pads without disturbing parking brake adjustment Use with 3/8-Inch drive ratchet and extension The right tool makes the job easier