Continuous flight auger (CFA) piling is a method of building deep foundations by drilling and pouring concrete in one operation. It's a quick, economical, and quiet way to create stable foundations in many soil conditions. 

Cased Secant Piling (CSP) piles are constructed by drilling hollow stem augers encased within a string of casing to the required depth. A twin rotary drive system rotating in opposite directions allows soil extraction and casing installation simultaneously.