A Quick Way to Spread Brake Pads and Compress Disc Brake Pistons for Pad Replacement on Single, Double & Quad Piston Calipers. Simultaneously compress all four pistons on quad piston applications. Can be used while caliper is on the vehicle or hanging free. Makes brake pad replacement a quick and easy job. * 29100 PLATE DIMENSIONS: -.220" thick - 3 3/4" wide - 1 7/8" reach (top of plate to outrigger arm) *These handles are painted aluminum * Spreads 2 1/2" * Tool plates do not rotate