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Rich & Varied Drill Bit Kit: This is 4pcs drill bit set, including bits for drilling pilot holes for screw sizes #6, #8, #10 and #12. These drill bit is made from 4241 carbon steel, it is higher hardness than ordinary drill bit, more wear-resistant

Quick-Change Hex Shank: The standard hex shank is compatible with rapid changes, adjustable counter sleeve depth and wrench. This 0.3in(6.35mm) hex shank fits into majority pistol drill and drill press, more easily and securely without slip and shedding

Easily Use & Adjust: Drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew. You can drill and countersink for wood screws without changing the drill bit

Size & Package: The pacakge of this drill bit kit inlcude 4 different sizes of drill bit and a hex wrench, the 4 drill bit's sizes divide into 6# 2.17in, 8#2.36in, 10#2.48in, 12#2.56in, the hex wrench diameter: is approxiamtely 6.35mm / 0.3in

Unique Design: Special designed steel counter sleeve countersinks or counter bores pilot hole. It can be used for drilling walls, bricks, wood, glass, tiles, stainless steel, concrete, etc.