All fitted with hollow head set screws. Any standard double groove Packard Drive sheave can be used as a companion sheave. 3L Belts Max Pitch: 2.5. 3L Belts Max. Turns Open: 0. 3L Belts Min. Pitch: 1.7, 3L Belts Min. Turns Open: 4, 4L or A Belts Min. Datum: 1.9, 4L or A Belts Max Datum: 2.9, 4L or A Belts Min. Turns Open: 5, 5L or B Belts Max. Turns Open: 1, 5L or B Belts Min. Turns Open: 5, 5L or B Belts Max Datum: 3.2, 5L or B Belts Min. Datum: 2.4, Bore (In.): 5/8, Brand: Packard, Country of Origin: CHINA, Outside Diameter (In.): 3.15, Pulley Type: Variable Pitch Pulley, Stock Bore (In.): 5/8, UPC: 840899125176