Complete 3-Piece Countersink Drill Bit: The Set Includes 3 High-Speed Steel (Hss) M2 Tapered Bits In Sizes #10, #12, And #14 (1/8", 9/64", 5/32" Drills), With A 3/8 82 Counter-Bore And A 1/4 Hex Shank For Both A Secure Grip, A Universal Compatibility With Most Drills. | | Depth Adjustable Maximizing Versatility: Both Pilot Drill And Counterbore Depth Are Adjustable With A Frictionless Depth Stop And Wrench Included, To Achieve Accurate Drilling. The Added Frictionless Depth Control Collar Can Reduce Surface Marring Effectively. | | Sharp Carbide Cutting Edges: M2 Hss Pilot Drill Bits With Spiral Chip Flute, Ensure Rapid Cutting; Sharp Tungsten Steel Alloy Cutting Edges Create Smooth Countersink And Counterbore Holes, Ideal For Screws Fitting 82-Degree Imperial (U.S.) Standards. | | Wide Range Of Application: Working With Natural Woods, Chipboard, Man-Made Boards, Plywood, Mdf, Aluminum, Non-Ferrous Metals, And Decking. For Best Results And Smooth Edges, Operate The Countersink At.