[High speed steel] The countersink drill bits set is made of high speed steel, quenching treatment shell designed, high hardness, good abrasion resistance, durable.
[Removable & adjustable] Drilling length of the countersink drill bits set can be adjusted for various length screws simply by loosening and tightening the screw.
[Design] 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.
[Function] 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. Use on wood.
[After-sales service] If there are any using defects or unpleasure with our products, please feel free to contact us, our professional support service will reply you within 24 hours, and we will consult the issues with sincerity.