The Tri-Power 3 piston aluminum caliper was originally developed as a inchQuick Change inch caliper to replace the 2 piston floating calipers on the C5 Corvette. Due its overwhelming success we decided to go one step further and make a Tri-Power caliper that would work for 1/2, ? & 1 Ton Trucks. All Tri-Power calipers are made from billet aluminum and consist of 3 stainless steel pistons ranging in sizes from 30mm to a massive 51mm depending on the application. Depending on the application these calipers are available with rotor sizes up to 14 inch in diameter. Full kits are available for most Muscle cars, Late Model Performance, Street Rods, Trucks & Suv's.