The dewalt d21570k dry diamond drill has a new motor which gives improved performance in applications with dry core bits up to 127mmn in bricks or soft masonry the electronics provide e clutch power up and overload protection and the two speed gearbox for increased versatility when drilling in wood metal and concrete with standard drill bits the electro mechanical clutch increases user control and protection and the heavy duty 16mm steel chuck allows quick bit change whilst offering excellent bi