Improved percussion for better performance and increased speed new with manual spindle lock for locking the one piece quick action chuck ergonomics and rubber hand grips as well as the two finger switch enable fatigue free and handy operation switchable carbon brushes for a constant power in both the right and the left hand drive max drilling capacity in wood 20 mm in steel 13 mm in concrete 13 mm technical specifications power input 500 watts idle speed 0 2 800 rpm