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: 4.7. 3L Belts Max. Turns Open: 0. 3L Belts Min. Pitch: 3.9, 3L Belts Min. Turns Open: 4, 4L or A Belts Min. Datum: 4, 4L or A Belts Max Datum: 5, 4L or A Belts Min. Turns Open: 5, 5L or B Belts Max. Turns Open: 1, 5L or B Belts Min. Turns Open: 6, 5L or B Belts Max Datum: 5.3, 5L or B Belts Min. Datum: 4.3, Bore (In.): 7/8, Brand: Packard, Country of Origin: CHINA, Diameter (In.) Datum A: 4.0-5.0, Diameter (In.) Datum B: 4.3-5.3, Diameter (In.) Pitch 4L: 4.0-5.0, Outside Diameter (In.): 5.35, Pulley Type: Variable Pitch Pulley, Stock Bore (In.): 7/8, UPC: 840899123547