General description These 150 pieces mini twist drill bits set includes 24 different sizes ranging from 0.4mm to 3.2mm, making it ideal for various DIY woodworking projects. Made from high-speed steel, these drill bits are designed to be rustproof and durable, ensuring a long service life. Technical specifications Material: High-speed steel (HSS) Sizes: 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.8mm, 3.0mm, 3.2mm Usage These micro drill bits are suitable for a wide range of materials including wood, resin, jewelry, nuts, amber, beeswax, olives, beads, PVC, acrylic, and plastic. Other information Portable storage box with separate grids for organizing drill bits Sizes marked on the box for easy identification