The Twist Drill Bit Set includes: 1 Hand Drill, 25 Drill Bits (0.5mm x 5 pcs, 0.6mm x 5 pcs, 1.0mm x 3 pcs, 1.2mm x 2 pcs, 1.5mm x 2 pcs, 1.8mm x 2 pcs, 2.0mm x 2 pcs, 2.35mm x 2 pcs, 3.0mm x 2 pcs). Clamping range of black hand twist drill: 0.3–3.5mm. Wide application: This hand drill is suitable for use on wood, jewelry, nuts, amber, beeswax, olive nut, pearls, PVC, acrylic, and plastic, as well as various DIY projects requiring precise holes. Portable design – pen-sized for easy carrying and storage. The set includes 25 different drill bit sizes to meet a variety of needs. Durable construction – made from hardened steel for reliable performance in hobby and precision tasks. Note: The adjustable pin vise is a manual tool, not powered. Twist drill bits are not intended for hard materials such as steel, iron, or stone.