Here's a great cast iron gear / sprocket. Made just like the ones of the past. These have the same look of the antiques, but at a much lower price
 
Measure approx. 6" tall top to bottom, 1/2" thick. Center hole 1/2" and weighs 1.25 LBS   

Great item for re-sale or for those restoration projects. This item was manufactured to look antique, expect some built in imperfections. Satisfaction Guaranteed