20 Different Size: 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm. Micro Mini Twist Drills Bits, made of high-speed steel, durable and sharp, small drilling resistance, chip removal smoothly. Come with a specially designed box, twist drills in every size have their own slot, keeps bits securely in place, and dispenses on drill bits at a time. Great for all sorts of jewelry DIY craft watchmaking, also ideal for woodworking, home, wood/plastic products, electronic parts repair work, etc. Please Note: This mini drill bits set Not suitable for processing steel, iron, stone, and other hard things. Specification color: as show Material: High-speed Steel Size: 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm. Package Includes 20 x Micro Twist Drill Bits