11T tooth steel gear, 5/8" bore, 410 BMX bike chain width.To be used with a 5/8" keyed shaft. Two set screws.

Please Note: This gear will accept a 415 chain. A 415 chain is wider than 410, but all other aspects of a 415 chain are the same as a 410 chain. The gear/sprocket will be quite thin for a 415 chain, and will work in some designs.