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Features: Product Name: PCB drill bit 10pcs Brand New Unused Carbide PCB CNC Drill Bits replacements for your CNC machines and any Handheld tool: Rotary Tool, Jewelry,these long-lasting bits are made from high quality tungsten steel for a precise, easy experience It is brand new with best quality from the professional factory Great for PC Boards, Plastics, Fiberglass, Wood, Soft Metals, etc Carbide rods and tungsten steel rods, with high hardness, high wear resistance, high strength, resistance to bending, anti-impairment and long tool life. Specification: Shank diameter (SD): 3.175mm 10pc Cutting edge diameter (CED): 0.3-1.2mm (Size Include :0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2mm) Total length: 38mm Quantity: 10PCS Package Included: 1 x 10pcs Carbide PCB Drill Bits with Protection Box Guaranty: Within 90 days product quality is not completely satisfied, please CONTACT US, 100% refund or return! Note: These bits are good quality but too tiny, specially for size of 0.3mm 0.4mm 0.5mm, it is very fragile for handling, so please be careful and take good control of your CNC speed.