Golden Jet Impact Drilling Cutters from Enz USA are designed to remove stubborn deposits like concrete and 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 also cut out dropped liners and prep for a reline job. Cutters range from 4- to 24-inch pipe diameters. They come with tungsten carbide and/or diamond-tipped teeth, and they work with the percussion system of 600 to 3,000 impulses per minute and up to 12 tons of impact force. All impact drilling cutters can be operated without impacts by means of a simple mechanical changeover. 877-369-8721; www.enzusainc.com.