●【High No-load speed】:1900rpm ●【Maximum borehole diameter】: 160/180mm ●【Dual Protection】: built-in mechanical safety clutch and electronic overload protector. ●【Ergonomic Handle】:can rotate 360 degrees to the side handle, adapt to more applications. ●【Applications】: used for the punch and engineering samples in the construction and installation, municipal engineering, strengthening works, gas, heating, ventilation, chemical pipe laying, installation of air-condition equipment, and the construction of roads and bridges guardrail.