Most earth augers have a gear box that helps to increase the torque, or twisting force, of the auger bit. This allows the user to drill deeper holes with less effort. The gear box is usually located at the top of the auger, near the handle or power source. There are more than 10 models earth auger gear case assy developed and produced by HENGYUE. These earth auger gear boxes have different speeds, torques and functions. eg normal speed 29:1 small gearbox, 25:1 fit with 4 stroke gasoline engine power, 5:1 for core drill machine and ice drill machine. These earth auger gear boxes with quick stop clutck drum, with reverse function and so on. The earth auger gear case body material is ADC-12 new aluminum, and the shell is thickened.The housing is machined by a high-precision machining center to ensure the precise dimensions of the earth auger gearbox.