General description The CSPARKV 70mm Blue Gray Drill Bit is designed for woodworking and is ideal for drilling holes in various materials such as wood, plywood, and plastics. Its tungsten carbide cutting tip ensures durability and sharpness, making it a reliable tool for both professionals and DIY enthusiasts. Technical specifications Drilling diameter: 70mm Shank dimension: 9.7mm Overall length: 80mm Usage Compatible with bench drills, vertical drills, hand-held electric drills, impact drills, CNC cutting machines, and other drill presses. For drilling hard materials like hardwood, it is recommended to use water injection to enhance accuracy and prolong the life of the hole opener. Not suitable for drilling metal and non-ferrous metals, as this may damage the hole opener. Ensure there are no nails or metal objects in the wood before drilling to prevent damage to the drill bits. Regularly sharpen the cutting edge and tip of the hole opener for optimal performance.