7/8" x 18", Ship Auger Bit, New Through Center Cutting Design For Improved Life In Nail Embedded Wood, The Flutes Are Coated, Which Produces A Non-Stick Surface For Fast & Smooth Chip Ejection, Especially In Deep Holes, The Shanks Are Also Impact Rated For Added Durability & Versatility No Matter The Trade, Ideal For Electricians, Plumbers, Utilities & Any Trade Requiring Fast Hole Drilling In Clean Or Nail Embedded Wood.