【Efficient Multi-Step Design】:The drill bits feature a multi-tiered step structure, allowing for drilling holes of different diameters in a single pass without frequent bit changes, significantly improving efficiency—ideal for multi-size drilling needs
【Blue-Plated Coating for Enhanced Durability】:The blue-plated surface treatment increases hardness and wear resistance, reducing friction heat and extending bit lifespan, making it suitable for continuous drilling in tough metals (e.g., steel, alloys)
【Precision Cutting Performance】:The HSS twist drill's spiral flute design optimizes chip removal, minimizing bit jamming. Sharp, precise edges ensure smooth and clean holes, reducing burrs and th4e need for additional finishing
【Versatile Compatibility】:The 19-piece set covers common diameters (1–10.5mm) and works on metal, wood, plastic, and more, making it suitable for DIY, mechanical repairs, and industrial applications
【Easy Storage】:The entire drill bit set is kept in a metal box with a size index holder for easy storage and organization. It is suitable for professional technicians or home users as a cost-effective long-term tool reserve