This tool  is a powerful dry diamond core drill for shock-free drilling in brick and other abrasive materials. This professional tool is suited to create wall and ceiling orifices up to 5-1/4" in diameter. Electronic torque limitation and speed control guarantee constant RPM even under load.  Features a mechanical safety clutch, acoustic overload indicator, electronic torque limitation and speed control.  Metal gearbox housing and   maintenance-free double-speed gearbox.  Furnished with metal carrying case.  Core Bits Not Included (See "Drill Bits" in our Cutting Tools Section).