Specification:Cutting Diameter: 25.5mm / 1"Shank Diameter: 1/2"Cutting Edge Length: 80mm / 3.15"Overall Length: 148mm / 5.83"Material : High Speed Steel 6542 (HSS 6542)Finish Type: Black Oxide, NitridingShank Type: Round ShankTool Flute Type: SpiralHardened to: 65-66 HRCDescriptions:1. High-speed steel tool is good for most general purpose applications, featuring a combination of hardness and toughness for wear resistance2. Reduced shank drill expand the size range capacity of a portable drill chuck. Common flute and overall length for minimal adjustment during tool changes.3. Black oxide treatment adds lubricity. Small pockets on the surface of the tool that act to hold coolant near the cutting edge.4. Design for drilling in low and medium tensile strength materials, such aluminum, iron, copper, brass and metal.5.