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Description: This twist drills bits are perfect for drilling through hard materials for model engineering, jewelry repairs, craft work, suitable for PCB, SMT, CNC, mold, sculpture, plastic, copper, stainless steel. Specifications: Material: Cemented carbide, HHS Cutting Edge Diameter: 0.1, 0.2, 0.3, 0.4, 0.5, 0.7, 1.2, 1.3, 1.4mm(Optional) Shank Diameter: 1/8" /3.175mm Length: 38.1mm / 1.5" Box Size: 8.7 x 5.3cm / 3.42 x 2.08" Package Including: 10pcs x Drill Bits Note: Due to different batches, color of rings are random. Thanks for your understanding.