Feature: 1. Good chip removal, double‑edged milling cutter edge chip removal speed is fast, not easy to break the cutter head. 2. Sharping cutting edge and large spiral groove designed can prevent chip accumulation. 3. The anti‑vibration designed of the blade can reduce the vibration of the machining process and improve the surface quality. 4. Using high‑quality materials, strong and durable, has a long service life. 5. 10Pcs drill bits can meet your use and replacement needs, very practically. Specification: Item Type: Micro Drill Bit SetTool Handle Type: Straight shank Cooling Type (internal Cooling/external Cooling): External cooling Cutting Diameter (mm): Approx. 0.2mm / 0.01in Diameter of Handle (mm): Approx. 3.175mm / 0.1in Length of Chip Pocket (mm): Approx. 5mm / 0.2in Useful Length (mm): Approx. 5mm / 0.2inPackage List:20 x Micro Drill Bit(2 x 0.1mm, 2 x 0.2mm, 2 x 0.3mm, 2 x 0.4mm, 2 x 0.5mm, 2 x 0.6mm, 2 x 0.7mm, 2 x 0.8mm, 2 x 0.9mm, 2 x 1mm)Size: Approx. 0.2mm / 0.01in 0.3mm / 0.01in 0.4mm / 0.02in 0.5mm / 0.02in 0.6mm / 0.02in 0.7mm / 0.03in 0.8mm / 0.03in 0.9mm / 0.04in 1mm / 0.04in . Package List: 2 x 0.1mm Micro Drill2 x 0.2mm Micro Drill2 x 0.3mm Micro Drill2 x 0.4mm Micro Drill2 x 0.5mm Micro Drill2 x 0.6mm Micro Drill2 x 0.7mm Micro Drill2 x 0.8mm Micro Drill2 x 0.9mm Micro Drill2 x 1mm Micro Drill