8mm GT blower pulley 3.50" wide hard anodized. 2.00" register bore, six 3/8" mounting holes on a 2.782" bolt circle. Fits 4-71 thru 18-71 roots and screw superchargers.
41, 42 tooth blower pulleys are made from 2024 alum. for strength purposes due to being so thin making the purchase price higher than a 43 tooth.