The Roughneck R600 pneumatic percussion drilling system from HammerHead Trenchless Equipment is designed for drilling solid rock with bit diameters of 7.25 to 8 inches. The R600 joins model R400, designed for 5.25-inch straight and offset bits, and the R500 for straight and offset bits to 6.25 inches in diameter. Capable of penetration rates of 150 fph, the hammers feature a heavy-duty, high-flow housing, pullback kit, control station/oiler and drill conversion kit. 800/331-6653; www.hammerheadtrenchless.com.