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Specifications:Type: mortise chisel drill bitMaterial: HSSItem Color: grayDiameter: 12.7mm/0.5inchLength: 19.5cm/7.66inchWeight: 230g/8.11oz Hole saw drill bit: Designed to install on the mortise chisel machine to saw hole on the wood material.High performance: The drill bit is sharp enough to drill a new hole with minimal effort without chips or breakout, energy-saving and time-saving.Exquisite workmanship: Designed with efficient square hole, providing uniform force and smooth punching without burrs, uneasy to break with low-noise working.Superior material: Made of premium high-speed steel material, sharp, durable and wear-resistant, with accurate positioning, and high temperature resistance.Wide application: Great for various of woodworking, carpentry and wood DIY work, also great for architecture and maintenance work.