The HP1641K offers 2-mode operation ("rotation only" or "hammering with rotation") for multiple applications. The HP1641K is powered by a 6 AMP variable speed motor for the most demanding applications. Capacities include 5/8" (concrete), 1/2" (steel), and 1-3/16" (wood), with a full 0-44,800 BPM. The HP1641K weighs only 4.3 lbs. with a soft grip handle and recessed lock-on button for continuous use.