Crower Gear Drives are made from lightweight aluminum alloy, the Shaver-Wesmar gear drive designed to provide accurate, consistent cam timing under the toughest racing conditions. Features gears precision cut from 8620 steel with 20° pressure angle, a crack resistant steel idler gear support, Torrington bearings and a tough black oxide finish. Quick and easy installation without any machine work required. The absolute highest quality available. Fully adjustable.