Ampflow-Sprocket-&-Key-for-E30-&-A28-Motors-Ampflow-Sprocket-9B-P-These-sprockets-have-a-12-7mm-frac 12-in-bore-to-fit-Ampflow-E30-&-A28-motors-&-are-supplied-with-a-suitable-key-P-P-The-sprockets-have-9-teeth-&-work-with-35-roller-chain-P-Ampflow-Sprocket-&-Key-for-E30-&-A28-Motors