1-1/2" ship auger bit. DeWALT power ship auger bits drill fast, rough holes in wood. Ship auger bits are most commonly used to drill through holes for wire and pipe insulation on the residential construction site. The length of the 6" bit is well suited for wood boring. Dual cutting edge provides maximum durability in nails. Hollow center flute provides aggressive chip extraction. Heat-treated and tempered for longer life. Resharpenable edge allows for longer bit life. Self-feeding screw provides fast material penetration. Diameter: 1-1/2", Overall Length: 6", Shank Diameter: 1/2", Type: Power Ship No. DW1681: Diameter: 5/8", Overall Length: 17", Shank Diameter: 1/2", Type: Power Ship