Kits feature RK's premium, lightweight RX- or XW-ring sealed racing chain in either gold or natural finish. Includes a premium Driven® C45 steel alloy black case-hardened rear sprocket paired with Driven® C45 steel case-hardened and quenched front.Chain & Sprocket 520 Conversion Kit. For MORE GREAT DEALS on Vintage and Classic Cycle Parts! Your friends at Classic Cycle Parts appreciate your Business! This item is in the category "eBay Motors\Parts & Accessories\Motorcycle & Scooter Parts & Accessories\Transmission & Drivetrain\Final & Primary Drive Parts & Kits\Other Belt, Chain & Sprocket Parts".isell" and is located in this country: US. This item can be shipped worldwide.