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【Create Clean Countersunk Holes】Shape neat 90° recesses for countersunk screw heads with five sharp cutting edges designed for smooth and efficient material removal. The tapered profile helps create a flush finish while reducing rough edges and excess material around the hole. 【Choose From Three Sizes】Keep 9 countersink bits ready for different jobs, including 3 pieces each in 12mm, 16mm and 19mm sizes. The selection makes it easier to match the countersink diameter to different screws and project requirements around the home or workshop. 【Use Durable High Carbon Steel】Made from high carbon steel with good hardness and wear resistance, these counter sink drill bits are designed for repeated drilling and countersinking tasks. The black finish adds a practical touch while the cutting edges support consistent everyday performance. 【Change Bits Quickly】Fit the 1/4 inch hex shank into compatible drills for convenient bit changes without complicated setup. The hex design is suitable for most standard electric and cordless drills, helping you move efficiently between different countersinking sizes during DIY or workshop tasks. 【Work Across Common Materials】Use these counter sink drill bits for wood, plywood, MDF, fibreboard, particleboard, PVC, plastic, insulation board and thin aluminium sheet. They are suitable for furniture making, cabinetry, repairs, woodworking, home improvement and general DIY projects.