Pulley is made from billet aluminum and is hard anodized for wear resistance. Teeth are HTD profile. Fits 4-71 thru 18-71 roots and screw superchargers. Pulley has one offset hole for early type crank hubs that have one offset mounting hole but pulley can be used on crank hubs with all six bolt holes that use equal bolt spacing with no issues.
Bore has been sanded to fit on a crank hub so be sure to note before purchasing if that will be an issue.
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.