Crafted from hardened alloy steel for long life, DeWALT® long power ship auger bits feature a dual cutting edge for maximum durability in nails. A self-feed spur delivers expedited material penetration and hollow center flute provides aggressive chip extraction. Heat treated and tempered for long life. DeWALT® DW1691 Long Power Ship Auger Bit, 1-3/8 in dia, 17 in OAL, 12 in L Hollow Center Flute, 7/16 in Shank