Makita HM1500B 42-Pound Demolition Hammer Powerful 13.5 AMP motor delivers 1,300 BPM for the most demanding applications Innovative pneumatic compression system automatically adjusts air in the cylinder to minimize power loss and deliver unmatched power-to-weight ratio AC/DC switch for use with alternative power source Makita Motor Advantage engineered with field core interlocking steel laminations, dual ball bearing armature and more copper commutator bars, increasing energy transfer efficiency for more power and longer tool life Rubber-ringed brush holder cushions vibrations and lengthens life of brushes and armature Automatic brush cut-off protects commutator from damage for longer tool life Side handle swivels 360 for operator comfort and control Anti-vibration main handle reduces operator fatigue ""No hammering when idling"" function helps increase tool life Factory grease packed for reduced maintenance Accepts 1-1/8"" Hex Shank bits Steel Tool Case HM1214CX HM1307CB HM1203C HM0870C HM1317CB HM1214C HM1211B HM1100C HM0810B Innovative pneumatic compression system automatically adjusts air in the cylinder to minimize power loss and deliver unmatched power-to-weight ratio Patented idling mechanism reduces hammering while idling Rubber-ringed brush holder cushions vibrations and lengthens life of brushes and armature Automatic brush cut-out system Side handle swivels 360 for operator comfort and control