The Performance Machine Chain Conversion Kit includes the front and rear sprockets, rear sprocket bolts and rear sprocket spacer needed to convert your 2018-UP M8 Softail belt final drive into a heavy duty 530 O-ring chain drive. The 24 tooth front sprocket is CNC-machined from a premium 8620 nickel chromoly steel, case-hardened and finished with an electroless nickel plating for corrosion and wear resistance. The rear 51 tooth sprocket is machined from 7075-T6 billet aluminum and comes in a Black Ano finish. Both the front and rear sprockets are designed for use with .530 pitch chains. The rear sprocket spacer has the proper effective width to give you the perfect offset for proper chain alignment and comes in a Black Ano finish.