Daewon Model 50P621 0.6mm 0.7mm 0.8mm 0.9mm 1.0mm 1/8" Shank Tungsten Carbide Micro Drill Bits for Watch Making Modeling CNC PCB FR4 Circuit Board Production Woodworking Pre-Drilling 10 each 50 pack 1/8" 3.175mm shank Shipped in protective plastic case Japanese made tungsten carbide bits Multi-use: CNC, PCB, Jewelry, Toy Making, Installation.... Other sizes available