Camaro/Firebird 93-97 LT1 MBA Underdrive Crank Pulley, shipping is not included, finish is black MBA's under-drive crank pulley mounts and aligns to the proper location, use the alignment hole for orientation to the hub when installing. As with all MBA pulleys, they produce a taller rib profile for additional contact with the serpentine belt (to provide an anti-slip contact patch). Hardcoat differs from anodize in that it is 10 times thicker and twice as hard..... it's like having a steel skin on the aluminum.