Replacement Adapters for Heavy Duty Augers (Tube-Style Shaft) All Heavy Duty augers include the correct adapter with the original purchase. These adapters are available only if you need a replacement or backup. Built from precision-machined, heavy-duty steel, each adapter provides a secure connection, smooth operation, and reliable digging performance. Available Replacement Options Direct Drive AdapterFits 7/8" direct drive shaft powerheads. Threaded AdapterConverts 4" or larger Heavy Duty augers for use with threaded shaft drills (such as Stihl® BT45-style units). 7/16" Quick Attach AdapterDesigned for drills with a 7/16" quick-attach chuck, allowing fast, secure, key-free connection. 1/2" Hex AdapterFits standard 1/2" drill chucks. Note: This adapter comes standard with Heavy Duty augers—purchase only if you need a replacement.