Golden Jet impact drilling cutters from Enz USA remove stubborn deposits like concrete, injection cement, and calcareous and mineral deposits. It can be used as an alternative to digging up pipes under foundations or roads, and can also cut out dropped liners and prep for a reline job. Cutters range from 4- to 24-inch pipe diameters, and come equipped with tungsten carbide and/or diamond-tipped teeth. They work with the percussion system of 600 to 3,000 impulses per minute, and up to 12 tons of impact force. All cutters can be operated without impact by means of a simple mechanical changeover. 877/369-8721; www.enzusainc.com.