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❶ 【Tri-bit design】: The countersink drill bits set have Dia 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm with cutting edge CNC grinding teeth, tricuspid centering is better, will not produce offset, quasi-drilling and fast. ❷【High carbon steel material】: The countersink drill bits set is quenching, high hardness, good abrasion resistance, durable. ❸【Removable Adjustable】: Drilling length of the countersink drill bits set can be adjusted for various length screws simply by loosening and tightening the screw. ❹【Advantage】: Woodworking Drill Bits Set has large chip flute and five-edge chamfer machine, the operation of faster discharge of sawdust, you will get a nice smooth surface on any type of hard, soft wood or aluminum. ❺【Application】: Perfect for drilling machines with chuck, for drilling on hard wood or wooden floor. The countersink drill bits set are applicable to bench drill, hand drill etc.12 month warranty and friendly service. Any problem, please contact us whenever you feel free, we will solve it immediately.