This tool material is 45 # stee,Hardness of screws and nuts hrc35 Professional for Cummins NT855 Kta19/k38/k50 series disassembly cylinder liner Suitable for cylinder liner sizes with an inner diameter of 110-160mm Attention when using this tool with a length of 270-310mm Gently apply force to the claws first,Then check that both claws are under force at the same time,If not, please move the rack slightly until both claws are under force at the same time,Then we can increase the torque,Pay attention to the height of the claw when using it for the first timeCannot be higher than the outer diameter glue position of the cylinder liner,Weight 8.5 kgI hope all maintenance technicians can provide valuable feedback after using our store's tools.