Shell and Auger / Cable Percussion Global Geotech manufactures a full range of equipment for Shell & Auger (Cable Percussion) Drilling including:Site Investigation Casings to BS 879 Nominal Diameter 6” and 8”, including Casing Shoes, Drive Heads, Casing ClampsShell & Auger Tools including Shell / Bailer, Claycutter, Stubber and Cross ChiselHeavy Duty Sliding Hammers and Drive Head / Bell HousingSinker Bars, Swivel and Plain