The Flex BH 812 VV is a 2-Speed Electronic Dry Handled Core Drill. The drill has 14 Amp motor and infinitely adjustable speeds (0-3800 RPM). It is suited for vibration free drilling up to 6” holes into masonry, brick, clay, cinder block, soft limestone and asphalt. It is not for use on concrete. The Flex five-fold VV electronic control gives consistent speed control, soft start with acceleration trigger, overload protection, temperature monitoring and speed pre-selection. The drill has no hammering noise, no vibrations. These drills can be used in inhabited buildings without a second thought.