Variable Pitch V-Belt Pulley, Bore Diameter 1 1/8 in, Standards ISO 9001: 2008, For Belt Trade Size 3L, 4L, 5L, A, AX, B, BX, For V-Belt Type Classical, Cogged, Micro-Ribbed, Material Cast Iron, Maximum Pitch Diameter 3.50 in (3L), 3.9 in (4L, A, AX), 4 in (5L, B, BX), Number of Grooves 2, Outside Diameter 3.5 in, Set Screw Location 180 Degrees from Keyway, 90 Degrees Apart, 3L Pitch Diameter (Maximum) 3.5 in, 3L Pitch Diameter (Minimum) 2.7 in, 4L Pitch Diameter (Maximum) 3.9 in