Diameter: 1-1/8"Overall Length: 3-1/2"Shank: 5/16"Designed For Perfectly Smooth, Flat-Bottomed And Splinter-Free Holes. Even In End-Grain And Through KnotsIdeal For Drilling Decorative Holes For Fine Woodworking And Hinge BoringBrad Point Centers Bit For Easy Positioning Of HoleSuitable For Portable Drills Or Stationary Machines