Features Premium Materials: Use premium materials and fine grinding to make the blade sharper. The drill has large chip removal space, small chip removal resistance and smooth chip removal. Reduce cutting force and broken drill, improve hole wall quality. Easy to Replace: And can cut solder holes on PCB well. Packed in a great storage container, it's easy to grab the drill you need when you need it. Strong and Reliable Material, Durable: The large needle vise hand drill is made of high-quality aluminum alloy, which is compact and wear-resistant; the PCB mini drill is made of reliable tungsten carbide, and the micro twist drill is made of alloy steel, which is not easy to rust or deform , can be reused and serve you for a long time. Multiple Functions and Occasions: Mini twist drills have multiple functions, for example, they can help you a lot in engraving, engraving, drilling, in processing wood, plastic, carbon fiber, composite board, cloth, rubber, bone, glass , Stone, etc. In addition, the rotary tool vise can process, SMT, PCB, ordinary FR-4, CEM-3 board, CNC, etc., to improve your work efficiency. Explore DIY Fun: With these mini drills for jewelry, you can make your own wood crafts or jewelry, such as wooden home signs, puppets, bracelets, necklaces, keychains, and more, unleash your creativity and explore crafting Fun. Resin polymer wood craft DIY jewelry making engraving. Description: These bits work fantastic on PCB boards. Sharp and twisted flute will make the drilling be more easy and effortless. They come in a easy-to-use plastic case with a holder for each bit. Drills bits are perfect for delicate drilling through hard materials for model engineering, jewelry repairs, craft work, suitable for PCB, SMT, CNC, mold, sculpture, plastic, copper, stainless steel. Specifications: Material: Cemented carbide, HHS Ring Color: Random Cutting Edge Diameter: 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.7mm, 1.2mm, 1.3mm, 1.4mm(Optional) Shank Diameter: Approx 3.175mm Length: 38.1mm / 1.5" Box Size: 8.7 x 5.3cm / 3.42 x 2.08" Quantity: 10pcs per set Weight: 38g(approx.) Package Includes: 1 Set(10pcs) x Drill Bits Note: Due to different batches, color of rings might be different from the ones in picture. Please take the real one as standard. Thanks for your understanding. Package List