Allied Construction Products introduces the Hammerhead II Model HB 550, which is a self-contained hydraulic concrete slab buster designed to demolish concrete flatwork. The Hammerhead II can operate either vertically or horizontally on any concrete surface. An internal hydraulic cylinder and valve system compresses a heavy compression spring set. On the return stroke of the cylinder, the unit releases the trigger mechanism, which causes the 4-inch impact bar weighing 388 pounds to fire at the concrete with up to a 4,000-foot-pound-energy-class impact force.