MSD billet alum. alternator V-pulley is 2.570" in diameter, .690" shaft bore, .375" width where the belt rides and 1.650" down in the bottom of the belt groove. Once pulley is installed with the nut there is a nice billet cover that installs with two Torx screws on the front of the pulley with a CNC machined MSD logo. Step on the back of the pulley 1.180" in diameter and .140" tall off the back of the pulley.
Pulley looks like it has never had a belt run on it.
Note: This is a used item. This item might have been taken in on a trade. RBS may have inspected this item and deemed re-usable. There is no warranty expressed or implied with this item.