Ratcheting Caliper Spreader is equip with 2pc steel plates (4-5/8″L x 2-3/8″H) for Single, Twin or Quad Piston Calipers. Type: Ratcheting Caliper Piston Tool Set. The pads spread from a range of 1-1/2″ to 2-5/8″ pushing the caliper pistons back to allow plenty of room to install the new brake pads.