BlackStar D80E52 - Double Strand 80 Pitch QD Sprocket - 52 ToothThe BlackStar D80E52 is a 80 pitch double strand QD roller chain sprocket with 52 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket requires a QD Type E Bushing (sold separately). Specifications Part Number D80E52 Chain Pitch 80 Number of Teeth 52 Maximum Bore 3 1 2" Bore Type QD Hub Style QD Bushing Required QD Type E Bushing Strand Count Double Material