Specification: Material: Tungsten Steel; Coating: Blue NACO Coating; Size: 0.1-1mm(0.1/0.2/0.3/0.4/0.5/0.6/0.7/0.8/0.9/1.0mm); 0.3-1.2mm(0.3/0.4/0.5/0.6/0.7/0.8/0.9/1.0/1.1/1.2mm); 1.1-2.0mm(1.1/1.2/1.3/1.4/1.5/1.6/1.7/1.8/1.9/2.0mm); Shank Diameter: 3.175mm; Quantity: 10pcs. Suitable for circuit boards, electronic, SMT, mold, metal processing, telecommunications and other industries. Can be used for drilling iron, glass fiber, etc. Features: Upgrade blue naco coating material, high hardness and durable. Large drill bit chip space, chip resistance,chip smooth, small drilling heat, reduce smear. Extraordinary cutting edge sharpness, using nanotechnology and advanced grinding technology,reduce the cutting force, reduce the broken drill rate, improve the hole wall quality. Cutting edge strictly symmetrical: beneficial and efficient cutting, avoid offset drilling. Carbide PCB CNC drill Bits replacements for your CNC machines and any handheld tool. Note: Please note that 0.1mm, 0.2mm, 0.3mm is not blue naco coated. Package Included: 10 x PCB CNC drill Bits