This attractive drag pulley is made of 6061 billet aluminum, anodized for a long lasting finish, then re-machined for the complete 360 degrees of timing marks. No more degree rings to dissappear 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. This pulley will clear all dry-sump oil pumps. It does not use a belt. The diameter is 5 1/4"