BlackStar D100J60 - Double Strand 100 Pitch QD Sprocket - 60 ToothThe BlackStar D100J60 is a 100 pitch double strand QD roller chain sprocket with 60 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket requires a QD Type J Bushing (sold separately). Specifications Part Number D100J60 Chain Pitch 100 Number of Teeth 60 Maximum Bore 4 7 16" Bore Type QD Hub Style QD Bushing Required QD Type J Bushing Strand Count Double Material