Nail Cutting Ship Auger Bits with WeldTec - 13/16" x 17". WeldTec Ship Auger 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. Wide Flutes. 7/16" Quick Change Impact Shank. Fully Forged Body on bits 3/4" diameter and larger. Diameter: 13/16". Twist Length: 12". Overall Length: 17".