1.Size: 0.1-1mm; 1.1-2.0mm.2.Cutting edge strictly symmetrical: beneficial and efficient cutting, avoid offset drilling3.Various drill bit kinds, used in a variety of application needs4.Made tungsten carbide bits5.Fit for: PCB drilling machines, engraving machine, CNC and high precision special drilling equipmentDiameter:0.1-1mm: 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm ( 1pcs for each Value )1.1-2.0mm: 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm ( 1pcs for each Value )(Positioning ring color random)Carbide rods and tungsten steel rods, with high hardness, high wear , high strength, to bending, anti-impairment and long tool life drill bit chip space, chip ,Chip smooth, small drilling heat, reduce smear.Drill has a scraps discharge space,little and smoothly during the scraps discharge.Using high quality materials and fine grinding process makes bit more sharp cutting edge,reduce cutting force and broken drill and improve the quality of hole wall.Cutting edge strictly symmetrical: beneficial and efficient cutting, avoid offset drilling.Color: positioning ring color random Not accept SpecifyMaterial: Alloy tungsten steelPackage Contents:2 boxes of drill bitsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.