OOTDTY Features: 20pcs in one set, different sizes to meet different requirements. The drill bits made of witch material have high hardness, not easy to break, and to use. Suitable for drilling jewelry, ceramics, glass, semiconductor materials, etc. It can also be used for many other applications and is really useful and practical. Twist drills only, other accessories demo in the picture are not included. Specification:Material: High speed steel + diamond Drill Diameter: 1mm,1.5mm,2mm,2.5mmColor: as picture shownQuantity: 20pcs/setNote:No retail package. Please allow 0-1cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Contents:20 x Twist Drill Bits