Depth Adjustable: To achieve accurate drilling, the pilot drill and counterbore depth in the countersink bit are adjusted by adjusting the depth stop and drill bit with the wrench included. The added plastics Free Spinning collar can reduce surface marring effectively. 5-Piece Set: The carbide drill bits set includes 5 high-speed steel (HSS) M2 tapered bits in sizes 1/8inch, 9/64inch, 5/32inch drills+ 3/8inch 82° counter-bore and 11/64inch, 3/16inch drills+ 1/2inch 82° counterbore and a 1/4inch hex shank for both a secure grip and universal compatibility with most drills, which is the premium counter sink drill bit for wood. Sharp And Sturdy: The M2 HSS countersink bit with spiral chip flute, ensures rapid cutting; Sharp steel alloy cutting edges create smooth countersink and counterbore holes, ideal for screws fitting 82-degree imperial (U.S.) standard. Widely Used: Working with natural woods, chipboard, man-made boards, plywood, MDF, decking, drywall, and various plastic boards. Wood drill bit for best results and smooth edges operate the countersink at slow speeds, approximately 200 RPM. Compact and Convenient: The carrying case contains 5 countersink drill bits, an additional plastic free spinning collar, an wrench, and only 8.82 ounces/250g weight, so it's straightforward to carry everywhere. The hanging hole of the wood drill bit set design allows you to hang it freely. Color: As Shown Material: High Speed Steel Package Contents: 1* Countersink Drill Bit set