This attractive drag pulley is made of 6061 billet aluminum, anodized for a long lasting finish, then remachined for the complete 360 degrees of timing marks. No more degree rings to disappear or fade! The pulley is then mounted to a steel hub with 8 counter sunk Allen bolts, making this pulley clean, lightweight yet strong! Available in Red, Black, Blue or Silver. Comes in 4 1/2" & 5 1/4" diameters. The 4 1/2" pulley will clear all dry-sump oil pumps.