V-Belt Crankshaft Pulley; 2.5 in; 1 in. Dia. Crank Driven Mandrel w/1/8 in. x 1/8 in. Keyway; • Ideal for driving alternators and/or vacuum pumps at optimum speed • Fits any 1" dia. crank-driven mandrel with 1/8" x 1/8" keyway • CNC machined from billet aluminum with hard-coat anodized finish • May be used with Moroso Vacuum Pumps Nos. 22640, 22641, 22642, 22644, 22840, 22842, 22843 and Vacuum Pump Pulley Nos. 64885 and 64887