Models HTD 5M 60T 16mm bore 15 656 3 HTD 5M 20T idler with bearings 6mm bore 3 247 0 HTD 5M 100T 16mm bore 3 283 1 HTD 5M 40T 10mm bore 7 538 1 HTD 5M 20T Pulley 10mm bore 10 1039 1