Seymour Augers (4)Iwan augers are general purpose design for use in a variety of soils. Steel blades are riveted to tough malleable iron yoke. Adjustable Iwan augers will bore holes of varying diameters. The tree feeding auger bores a 2" diameter hole for applying plant food and water to roots.The Digwell auger has a telescoping steel handle for a total working length up to 8'6". The square steel extension is dimpled at 7" intervals for locking in settings.