Motion Pro Brake Caliper Piston Tool Motion Pro is dedicated to producing the most versatile, unique and durable products for professional and home use. Motion Pro tools are designed to be simple to use, yet durable enough to withstand the harshest conditions. One of their goals is to offer tools of convenience. Do it right the first time with Motion Pro Tools.Ultra-low profile design removes pistons from monoblock disc brake calipers.Fits pistons with a center bore of 15 mm to 28 mm.Easy-to-use single locking screw.Works on aluminum, steel, and titanium pistons.