Easily deal with stubborn screws, oppose smooth water pipes, strong operation of mechanical parts, overcome tenacious water pipes, and deal with corroded nuts. The clamp body is forged by tool steel in one, and the whole body is heat treated, with high hardness, large torque, strong toughness, strengthening the hard teeth, strengthening the torque smooth without slipping. Uses: home decoration pipe fittings maintenance, rusty pipe fittings loading and unloading, engineering construction pipe fittings loading and unloading, automobile maintenance, etc.