Professional bicycle chain tool: a hook as a chain holder and a replacement pin made of stainless steel are included, with which the chain can be easily held together and assembled. Universal: very easy to use bicycle chain splitter is specially designed for removing pins in 7, 8, 9, 10 and single bikes and their chains. Robust and strong: the chain rivet press is made of stainless steel and high quality plastic, very strong and sturdy, not easy to bend and deform. Smart design: easy to break, easy to re-chain --- unique groove on the top makes it easy to see how far you pop the pin out and remove the cut chain with pin from the tool. Easy to use: simply open a piece and insert the chain. Step: 1. Please loosen both ends of the screw. The hollow screw (opposite the pin) must be screwed in to support the chain while you turn the handle and apply pressure to push the pin out. 2. Screw the screw on both sides and continue to screw until the chain pin is cut. 3. Make sure the pin aligns the chain pins. Includes: 1 x bicycle chain tool. Tips: As the size of the chain is different, you need to find a fixed place for the chain before screwing.