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【Complete 29-Piece Set】TOLESA countersink drill bit set Includes 5 countersink drill bits: #4 (2 mm), #6 (2.4 mm), #8 (2.8 mm), #10 (3.2 mm), #12 (3.6 mm)); 5 replacement drill bits; 2 wood plug cutters (3/8", 1/2"); 15 S2 screwdriver bits (11pc 1", 4pc2") ; 1 magnetic extension; 1 hex key, all in a durable storage case. 【Premium HSS Construction】Made from durable M2 high-speed steel with a black nitrided finish for improved hardness, wear resistance, and rust protection. Suitable for softwood and hardwood applications; prolonged hardwood use is not recommended. 【Dual-Flute Fast Cutting】This countersink drill bit set features dual-flute cutting edges that cut smoother and faster than single-flute designs. Reduced vibration and cleaner countersinks help create professional-looking woodworking results. 【All-in-One Drilling Solution】 The integrated design combines drilling, countersinking (82°), and counterboring in a single operation. Adjustable drilling depth and stepped chamfer blade reduce cutting resistance for higher efficiency. 【Versatile & Easy to Use】1/4" hex shank fits electric drills, hand drills, and bench drills. Magnetic extension and socket adapter add extra reach and compatibility. Compact storage case keeps everything organized and portable.