Fits 4-71 thru 18-71 roots and screw superchargers. Bore has been sanded to fit on a crank hub so be sure to note before purchasing if that will be an issue. Pulley has also had the rear of the pulley teeth machined off .125" to clear a crank trigger and be sure to look at the second picture as the pulley had some anodizing rubbed off but pulley is still in good condition with lots of laps left 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.