3PCS Step Drill Bit Set, HSS Stainless Steel, 4-12/20/32mm, Titanium Conical Triangle, with Hex Shank, for Drilling on Steel, Brass, Wood, and Plastic

[High-quality materials, quality assurance] The drill bits and cone drills are made of high-quality HSS stainless steel, ensuring durability. Operating suggestion: When using the electric drill, keep it as vertical as possible; do not shake or tilt it, and do not run the electric drill too fast. [Saving time and labor, efficient and fast] The HSS cone drill bit is made of high-speed steel, which reduces heat and friction, cools quickly, and automatically removes debris from the hole during drilling. The spiral design prevents 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 requirements. [Wide range of uses] The product can process thin iron sheets, aluminum, insulation panels, PVC panels, wood panels, and other materials up to 3mm thick. [Convenient carrying nylon bag] The product comes with a nylon carrying bag for convenient storage and protection. There is no need to worry about loss or wear caused by the small size of the product. 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 impact. Provides automatic, high-impact, spring-loaded adjustment through the cap; its brass body has a knurled surface for anti-slip control; and the carbide-tipped tip makes the center punch 10 times stronger than a normal punch; Protective aluminum sheath to prevent the tips from dulling easily. 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.