Atlas Copco adds new DTH hammer for small diameter holes. August 30, 2011 – Commerce City, CO – Atlas Copco Secoroc has introduced the newest member in their COP line of DTH (down-the-hole) hammers, the COP 20. This new multi-purpose DTH hammer is designed for 2.75 inch to 3.5 inch (70 to 89 mm) diameter holes in difficult ground conditions. The COP 20 hammer has been engineered especially for the seismic drilling industry and construction work such as ground reinforcement and anchor bolting…