This is a brand new rear brake drum and sprocketwith quick detach hub.
Part # 37-1040, W1040
Sprocket teeth: 46
Chain size: 530
Chain Pitch: 5/8″ X 3/8″
Fits: Triumph pre-unit and unit T120 with quick detach hub from 1960-70
Triumph T100 with quick detach hubfrom 1959 and up