For disc brake caliper piston adjustment. Dual-purpose tool is used both to adjust the piston position by screwing it into or out of the cylinder bore and to push piston straight back in the cylinder bore. Kit contains center screw and “T” handle, plate, disc and adapters to work with all calipers, including rear calipers on vehicles with self-adjusting parking brakes. Storage case complete with laminated instruction sheets with photos. Lifetime warranty.