[High-quality materials, quality assurance] The drill holders and cone drills are made of high-quality HSS stainless steel, which are 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. Time-saving and labor-saving, efficient and fast] The HSS cone drill 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-32mm, 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, PVC boards, wood boards and other materials with a thickness of no more than 3mm. Nylon cloth bag is convenient to carry The product is equipped with a nylon cloth bag, which can achieve good storage and protection effect. There is no need to worry about loss and wear caused by the small product. 3PCS Step Drill Bits 3PCS Step Drill Bits, Stainless Steel Titanium Metal The HSS titanium drill bit is made of high speed steel with a titanium coating, which is durable. Features: 1. Laser marking makes the dimensions clearer; 2. High speed steel for longer service life; 3. The 3-sided shank prevents slipping in the drill chuck; 4. The double cutting blade design allows for faster and easier cutting; 5. X-type opening design for easy removal of cutting residue during drilling; 6. The added cobalt reduces friction and lasts longer than those without cobalt chips; 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 & High Blow Provides an automatic, high-impact, spring-loaded fit through the cap; Its brass body has a knurled surface for non-slip control; and the carbide-tipped tip makes the center punch 10 times stronger than normal punches; aluminum protective case to make the tips not easy to dull. Wide Applications The titanium coating ensures easy cutting 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 an error of 1 - 3cm!!!Seuais