3/8" x 16", Spade Bit, For Clean Wood Hole Drilling, Double Wing Spurs Reduce Vibration While Creating Easy Hole Formation, Patented Cutting Edge For Easier & Faster Wood Boring Over Conventional Models, Cutting Edge Removes Chips Fast, 1/4'' Quick Change Hex Shank For Use In All Universal Quik Lok Extensions, Skin Carded Packaging.