Application: This Roller Chain breaker Tool is Easy for Go Kart, ATV, Chains Replacement. High Quality Material: The main parts of the chain breaker 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 HRC32-36. Pin material 65Mn, heat treatment HRC56-58, handle electrogalvanizing white zinc Using way: put the alloy head into the chain breaker, then alloy head just touch the top of pin of chain, clamp the roller, press wrench, then the pin will be squeezed out, then the chain is cut. For example, the chain is 11links, and you want to shortened to 8 links, then usually you need to disassembly two pins, and make it 7links and then use one connecting link to assemble to be 8 links. Used for Chains: 60-100 fit for 60, 80, 100, 12B, 16B, 20B