The Powerbuilt Ratcheting Single and Dual Piston Caliper Tool from Alltrade Tools features a ratcheting caliper spreader equipped with 2-pc steel plates (4-5/8” length by 2-3/8” height) for single, twin or quad piston calipers. 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. Ideal for most large trucks and commercial vehicles with Quad piston Calipers, 2-pc 7” by 2-3/8” Steel Plate Add On adapters are also included. These added plates allow for a larger length range to more effectively work on larger calipers. The Add On Plates snap directly on to unit and are held in place by magnets. The tool is easy to install and remove, according to the company.