This roller chain breaker tool is easy for motorcycle, bicycle, Go Kart, ATV, chains replacement. High Quality Material: The main parts of the chain detacher using special heat-treated precision mold steel to ensure hardness, abrasion resistance, can guarantee usage durable, it gives convenience to majority of users who want to shorten the chain. Guarantee the quality.Shell material: C45(carbon steel), heat treatment HRC 32-36. Pin material 65Mn, heat treatment HRC 56-58, handle electrogalvanizing white zinc. Using Way: First put the chain head into the chain Breaker Cutter, then chain head just touch the top of pin of chain, clamp the roller, press wrench, next the pin will be squeezed out, finally the chain is cut.such as the chain is 41 links, and you want to shortened to 38 links, then usually you need to disassembly two pins, and make it 37 links and then use one connecting link to assemble to be 38 links.