This sprocket came with an RK chain kit, kit was not designed for my bike I was happy with the chain after I broke it down to size and tried very hard to get a refund simply for the incorrect sprockets and all the company had to offer was send the entire kit back needless to say after breaking down the chain that was not happening I wanted to ride my bike. sprocket is correct to the part numbers never installed or used and is a true Driven steel sprocket.