Machined from billet aluminum, a Gilmer Drive Kits are a must for street/strip engines that have a problem with belt slippage at high RPM. Designed to work with factory OE-style alternator brackets, kits include billet aluminum crank pulley, water pump pulley, alternator pulley, and a 1-1/2" wide belt. Features: 1.5" wide belt eliminates slipping. Machined from billet aluminum. Perfect for street and strip engines.