5-Piece Set: The set includes 5pc tapered bits in sizes 1/8inch,9/64inch,5/32 inch, 11/64inch ,3/16inchdrills+ 1/2inch 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 marring effectively. And Sturdy: The M2 HSS pilot drill bits with spiral chip flute, rapid cutting; steel alloy cutting edges create smooth countersink and counterbore holes. 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. Colour:Photo Color Material:Aluminum Alloy Package Contents: 5pcs x tapered bits 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.