Bosch 11304K Brute 15 Amp 1-1/8-Inch Collared Hex-Breaker Hammer with Cart 8-inch diameter semi-pneumatic ball-bearing wheels 1-inch diameter all welded-steel frame, plus heavy-duty rubber tie-down 4 sockets hold 1-1/8-inch hex collar insert tools Shock-mounted handles absorb vibration One-year warranty