brand new and high quality This micro twist drill bits set is made of Tungsten Steel (Drill Bit tip) and high speed steel (grip), which is with high strength and high hardness performance. Precise and professional made, the specification of drill bits is range from 0.1mm to 1.0mm. Application: All kind of industrial and mechanical purposes Material: Tungsten steel + High-speed steel Specification: 0.1-1.0mm (0.1mm ,0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm) Quantity: 1 set(10pcs) Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, Thank you. Package includes: 1set x Micro Twist Drill Bits