Check the listing for details. 10pack #40 Chain Offset Half Link Roller 1/2" Pitch Carbon Steel for 08A Chain. Condition: New. Listed at 12.84 USD. Specifications: Chain No.: 08A(#40); Total Length: 23.8mm / 0.94-inch; Roller Diameter: 7.92mm / 0.31-inch; Pin Length: 17.75mm / 0.7-inch; Pin Diameter: 3.96mm / 0.16-inch; Inner Plate Depth: 12mm / 0.47-inch; Pitch: 1/2-inch / 12.7mm; Width Between Inner Plates: 7.85mm / 0.31-inch; Average Tensile Strenght:17.5kN; 10 x Connector Offset Half Link RollerMaterial: Made of carbon steel materials, finely processing, precision processing, strong, anti-oxidation, and durable.Appliance: This chain link roller connector is Easy for drive chains. Regular cleaning and lubrication can extend service life.How to Use: You can use appropriately sized circlip pliers to take apart the old chain link roller and remove it from the chain. To install the new chain joint, insert the pin first, then snap the spring clip in. Wear gloves carefully for safety.