[High-quality materials, quality assurance] Drill holders and cone drills 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] The HSS cone 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 slipping, 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 plates, aluminum, insulation boards, plastic boards PVC, wood panels and other materials with a thickness of not more than 3mm. The nylon cloth bag is convenient to carry The product is equipped with a nylon cloth 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 Stage 3PCS Countersink Drill Bit Stage, Titanium Inox Metal The HSS titanium drill bit is made of high speed steel with titanium coating, which lasts for a long time. Features: 1. Laser marking makes dimensions clearer; 2. High speed steel for longer life; 3. 3-sided shank prevents slipping in drill chuck; 4. Double cutting blade design allows for faster and easier cutting; 5. Design of type X openings to facilitate the elimination of cutting residues during drilling; 6. Added cobalt reduces friction and lasts longer than those without cobalt pieces; 7. The sharpness and titanium coating ensure easy cutting through most sheet metal, plastics and other materials. Specific Information Size 1: length 7cm, diameter (mm): 4 to 12: 4,5,6,7,8,9,10,11,12. Size 2: length 7cm, diameter (mm): 4 to 20: 4,6,8,10,12,14,16,18,20 Size 3: length 10cm, diameter (mm): 4 to 32: Automatic center punch and high blow Provides automatic, high-impact, spring-loaded adjustment through the cap; its brass body has a knurled surface for non-slip control; and the tip with carbide tip makes the center punch 10 times stronger than the normal punch; Aluminum protective case to make the tips not easy to blunt Wide applications Titanium coating guarantees cutting easily through most steel sheets, aluminum sheets, copper and plastic panels, wood and many other types of sheets with ease Delivery quantity: 3 pieces Product color: gold Product size: handle length 25mm Note: manual measurement, please allow 1 - 3cm error !!! Seuais