Check the listing for details. 10Pcs #50 Roller Chain Connecting Links 20.7mm Pitch Chain Master Links. Condition: New. Listed at 18.09 USD. Product Package: 10pcs #50 chain master links. Total Length: 1.12"/28.5mm; Pin Length: 0.87"/22.1mm; Pin Diameter: 0.19"/4.9mm; Inner Plate Depth: 0.58"/14.8mm; Pitch: 0.81"/20.7mm.Material: The chain links are made of carbon steel, precision machined, strong, and durable.Surface Shot-Peened: The standard chain end connector split links are shot-peened during the production process to improve the strength and toughness of the product and extend the service life of the chain.Easy to use: The links are easy to attach to the drive chain, making it easy to lengthen or shorten the chain; old sprockets can be removed with circlip pliers and removed from the chain. To install a new chain joint, first, insert the pin and snap the spring clip or cotter pin into place. Regular cleaning and lubrication can extend service life.