Counterbalance system reduces vibration to only 8 m/s2 for unmatched comfortPowerful 15-amp motor and efficient 1,100 BPM to tackle the most demanding jobsLowest noise level in its class at only 107dBAccepts popular 1-1/8" hex hammer steel bitsAutomatic brush cut-out system protects commutator for longer tool life16.4 ft. jobsite cord for greater versatility and instant powerCylindrical tool holder enables new bolt holes to be drilled should the original bolts breakWarning lamp indicates trouble with the cord; AC/DC switch for use with alternative power sourcesLarge, easy to operate switch for operator comfort and control