[High-quality materials, quality assurance] drill holders and cone drill bits are made of high-quality HSS stainless steel, durable. Operation suggestion: When using the electric drill, it should be as vertical as possible, do not shake or tilt, and the electric drill should not rotate too fast.Saving time and labor-saving, efficient and fast] HSS taper drill bit is made of high-speed steel, which can reduce heat and friction, cool quickly, and automatically remove debris in the hole when drilling. The spiral design can prevent slippage, making drilling easier and more efficient.Three sizes to meet your needs 4mm-12mm, 4mm-20mm, 4mm-32 mm, you can choose different drill bits according to your needs.A wide range of uses] The product can process thin iron plate, aluminum, insulation board, sheet metal PVC, wood panels and other materials with a thickness of not more than 3mm.Nylon fabric bag is convenient to carry The product is equipped with a nylon fabric bag nylon, which can achieve good storage and protection effect. There is no need to worry about the loss and wear caused by the small product.3PCS Countersink Drill Bit Step Bit, Titanium Metal Stainless SteelThe HSS titanium drill bit is made of high speed steel with titanium coating, which is long lasting.Features:1 . Laser marking makes the dimensions clearer;2. High speed steel for longer life;3. 3-sided shank prevents slipping in the drill chuck;4. Dual cutting blade design allows for faster and easier cutting;5. Design of X-type openings to facilitate the removal of cutting waste during drilling;6. Added cobalt reduces friction and lasts longer than those without cobalt bits;7. Sharpness and titanium coating ensure easy cutting through most sheet metal, plastics and other materials.Quantity delivered: 3 pieces