- Professional set of 10 HSS twist drill bits with M35 cobalt, diameters from 0.75 to 3 mm - Designed for drilling beads, metals, and making jewelry with maximum precision - High-quality material ensures hardness, heat resistance, and wear resistance - Optimized surface to reduce friction and improve drilling speed - Precise sharpening allows for clean holes, burr-free and professional finish - Compatible with alloy steel, iron, copper, bronze, cast iron, hard plastics, and acrylic - Long durability and excellent performance for DIY projects and workshops - Ideal for precision tasks in jewelry making, modeling, and demanding handcraft work