Description: Made of carbon steel materials, finely processing, precision processing, strong, anti-oxidation, and durable. This chain link roller connector is Easy for drive chains. Regular cleaning and lubrication can extend service life. 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. Please pay attention to the size and model before ordering. Specifications: Model: #120H/ DIN/ISO 24AH Material: Carbon Steel Surface Treatment: Peening Plate Thickness: 4.8inch Pitch: 1-1/2inch Width Between Inner Plates: 1.4inch (35.5mm) Pitch: 1.5inch (38mm) Pin Diameter: 0.43inch (11mm)