40Pcs Rotary Drill Bits Micro Connection Set 0.3-1.0mm HSS High Speed Steel Mini Drill Bits Power Hand Tools for PCB JewelryFeature:Good abrasion resistant. High working efficiency, good stamping effect and long service life. It is convenient to drill, simple to use, safe and reliable. Widely used in precision punching and slotting technology, such as vajra/walnut olive punching. Specification:Type: 0.3mm*5pcs, 0.4mm*5pcs, 0.5mm*5pcs, 0.6mm*5pcs, 0.7mm*5pcs, 0.8mm*5pcs, 0.9mm*5pcs, 1.0mm*5pcsMaterial: High Speed SteelPacking Size: About 100x5 0mm/3.94x1.97 inchesNote:Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures. Please allow slight deviation in measurement due to manual measurement.40 X Twist Drill Bits