About this item

• Three-Flute Spiral Design: The Unique Triple-Flute Design Provides Higher Roundness, Smoother Wall Surfaces, Superior Chip Removal Capabilities and Better Heat Dissipation Performance, Revolutionary Improvement in Drilling Efficiency ; Cutting speed increased by 40%; feed rate for deep hole machining increased by 50%; chip removal efficiency increased by 40%)
• 21-Piece Cobalt Drill Bits Set - Includes Metal Drill Bits: 1/16"(*2), 5/64"(*2), 3/32"(*2), 7/64"(*2), 1/8"(*2), 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 5/16", 3/8", 1/2" with Index Storage Case.
• Titanium Aluminum Nitride Coating (TiAlN) - Increases surface hardness to 89HRC with outstanding heat-resistance, so your drill bit cuts fast and stay sharp.
• ZNXIMER Cobalt Drill Bit Set Pro - A Metal Drill Bit Set for Steel, Hardened Metal, Stainless Steel. Consisting of 21 titanium aluminum nitride coated cobalt drill bits with Triple Spiral Flute and 135¡Æ Split Point Tip offers exceptional performance specifically for drilling through metal.
• Quality commitment - If you are not fully satisfied for any reason, Please contact us for 100% refund or replacement. Have any questions, Please feel free to contact us and we will be happy to assist you.