"IRWIN" WELDTEC SHIP AUGER BIT *1/2" auger bit *17" length *3/8" quick change impact shank *Full forged body on bits 3/4" diameter or larger *Speedbor with Weldtec ship auger bits are made stronger and last longer *Harder cutting edge is welded to the base material *2 times nail cutting life, compared to standard Irwin ship augers *Patent pending welded cutting edge *Aggressive screw pitch *Wide flutes *Discovery NBR, SUP