sprocket
size:03B-1,04B-1,05B1-2,06B-1-2-3,081B-1,083B-1,085B-1,085B-1-2-3,10B-1-2-3,12B-1-2-3,16B-1-2-3,20B-1-2-3,24B-1-2-3,28B-1-2-3,32B-1-2-3 
Z=Teeth: 8,9,10-125
Bore: polit bore,finished bore,and taper bore
We can also make special sprocket according to your drawing