Usage Tips:5-Piece Set: The 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° counter bore and a 1/4Inch hex shank for both a secure grip and a universal compatibility with most drills. Depth Adjustable: Both pilot drill and counterbore depth are adjustable by adjusting the depth stop and drill bit with the wrench included, to achieve accurate drilling. The added plastics collar can reduce surface marring effectively. Sharp And Sturdy: The M2 HSS pilot drill bits with spiral chip flute, ensure rapid cutting; Sharp steel alloy cutting edges create smooth countersink and counterbore holes, ideal for screws fitting 82-degree imperial (U.S.) standards. Widely Used: Working with natural woods, chipboard, man-made boards, plywood, MDF, decking,drywall,and various plastic boards. For best results and smooth edges, operate the countersink at slow speeds, approximately 200 RPM. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Blue Material:high speed steel Package Contents: 1 * Countersink Drill Bit Set with Low Friction Depth Stop Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.