BlackStar DS100ATL20H - Double-Single 100 Pitch Taper Lock Sprocket - 20 ToothThe BlackStar DS100ATL20H is a 100 pitch double single strand Taper Lock roller chain sprocket with 20 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket requires a Taper Lock Bushing (sold separately). Specifications Part Number DS100ATL20H Chain Pitch 100 Number of Teeth 20 Bore Type Plain Bore Hub Style Taper Lock Bushing Required Taper Lock Bushing Strand