March Performance 1000 Performance Series Steel Serpentine Pulley Kit - Set of 3 Includes 4 3/8" crank pulley, non-rib 5.5" water pump pulley and 2.5" alternator pulley Reduces accessory drag and produces 12.5 horsepower at the rear wheels Eliminates belt throwing to lessen block damage Designed for normal street driving Made in the U.S.A.