... lock assemble bushes:we are the professional manufacturer for pulleys, bushes ,Taper bushing, QD bushing, ... according to customer's requirement.bolt on hubs for taper bush:SM1200,SM1600,SM2500.....taper bushing: ... 5V, 8V c) Sheaves for split taper bushings: 3V, 5V, 8V d) Sheaves for 3L, 4L or A, ... : pilot bore, finish bore, taper bore, bore for QD bushing4) Surface finish: paint, phosphate, zinc plate5 ...