Bits are made stronger and last longer because a harder cutting edge is welded to the base material. 2X nail cutting life compared to standard Irwin ship augers. Patent Pending welded cutting edge for increased durability. Aggressive screw pitch for faster drilling. Wide flutes for maximum chip removal. 7/16" quick change impact shank for fast bit changes. Fully forged body on bits 3/4" diameter and larger for durability. Tubed.