Golden Jet Impact Drilling Cutters from Enz USA remove stubborn deposits like concrete, injection cement, as well as calcareous and mineral deposits. In many cases, the use of a percussion milling cutter is the only alternative to digging up pipes under foundations or roads. It can cut out dropped liners and prep for an ideal reline job. Cutters are available for 4- to 24-inch pipe diameters. They come with tungsten carbide and/or diamond-tipped teeth, and work with the percussion system of 600 to 3,000 impulses per minute and up to 12 tons of impact force. They can be operated without impacts by means of a simple mechanical changeover. 877/369-8721; www.enzusainc.com.