For high accuracy and efficient drilling of steels, carbon steels, and difficult-to-cut materials. Carbide drills can only be used in low vibration, high-speed rotary equipment, or carefully by hand using a pin vise. DO not attempt to drill using a hand drill or regular drill press, they do not possess the RPM or control capability required. Can be used in high-speed Dremel or similar tools if used in conjunction with a drill press stand to precisely control drill penetration. Breakage Of drill will occur if used otherwise. Features: Double-edged positive and negative spiral chip removal structure for long life Sharp and high wear resistance, professionally designed for milling wood. Cut top and bottom sides smooth and burr-free. The large spiral groove, imported tungsten steel base material Specifications: Type: Strawberries Model Number: Corn teeth Cutter milling Diameter : 3.175mm 4mm 6mm Material: Carbide Degree : R0.1 diameter: 3.175mm-6MM Package Includes: 1 x Carbide Steel CNC Engraving Drill Bits (Lot)