Assembly Guide --- 1. Install the right length chain, clean the bearings and lubricate them. 2. Don't forget to lubricate the pin. 3. Insert two halves of the missing link into the end of the chain. 4. Press the two halves of the missing connection contact together. 5. Lock in place by unlocking the chain. 6. Open: Press the two plates together and slide the ends of the chain against each other. Convenient to Carry and Avoid Losing --- This bike chain connectors can use repeatedly, easy to assemble and disassemble chain; Suitable for mountain bike and road bike, and it is convenient to carry and avoid losing. Easy to Clean --- Fit chain with the correct length, clean bearing, and lubricate. No need tool to remove the chain for cleaning. High Quality --- The bicycle chain link is made of quality steel material, high strength, wear resistant, sturdy and durable. The missing link is made of durable steel material, suitable for a long-term use. Product Quantity: 4 pairs Product color: gold Product size: 21*8.2*8.4mm