Variable Pitch V-Belt Pulley Bore Diameter 5/8 in For Belt Trade Size 3L 4L 5L A B For V-Belt Type Classical Material Zinc Maximum Pitch Diameter 3.80 in (3L) 4.30 in (4L) 4.50 in (5L) Number of Grooves 1 Outside Diameter 4.5 in Set Screw Location On Keyway 3L Pitch Diameter (Maximum) 3.8 in 3L Pitch Diameter (Minimum) 3 in 4L Pitch Diameter (Maximum) 4.3 in 4L Pitch Diameter (Minimum) 3.3 in 5L Pitch Diameter (Maximum) 4.5 in 5L Pitch Diameter (Minimum) 3.7 in