6 METAL GROUND ENGAGING PIER ASSEMBLIES AND PIER ACCESSORIES FOR PROVIDING STRUCTURAL SUPPORT FOR FOUNDATIONS, NAMELY METAL PIERS, METAL PIER SECTIONS, METAL PIER STIFFENING SLEEVES, METAL PIER LOCKOFF PINS, METAL FOUNDATION LIFTING HEADS, METAL PIER ADJUSTMENT SHIMS, METAL PIER LOAD TRANSFERRING SUPPORT BRACKETS, METAL PIER DRIVE STANDS, METAL STARTER SHAFTS, METAL EXTENSION SHAFTS, METAL HELICAL FLIGHTS, AND METAL ROCK ANCHOR SHAFTS