High Durability: Made of tungsten steel material for anti-bending and anti-fracture durability, ensuring long-lasting use. Black & Gold Oxide Finish enhances lubrication and corrosion resistance, improving the overall performance of the drill bits. Wide Range of Use: Can be used in stainless steel, aluminum alloy, iron, copper, brass, wood, plastic, and other metal materials. Convenient Design: The reduced shank design expands the capacity of a portable drill chuck and the spiral groove facilitates the export of metal chip, saving time and effort in operation. Precise Drilling: Sharp and spiral cutting edge provides neat and smooth cuts, helping you work more efficiently and get rid of glitches or scrap. Cutting Edge Diameter : 18mm; Shank Diameter : 12.7mm / 1/2 ; Cutting Edge Length: 76mm / 2.99 ; Total Length : 152mm / 5.98 ASIN B0C4H1SL48 Brand Name LEPEVNEY Unit Count 1.0 Count Part Number HJFKA3352K Point Style Center Point Finish Types Gold Oxide Manufacturer LEPEVNEY Material Type High Speed Steel (HSS) Tool Flute Type Spiral Cutting Diameter 18 Millimeters Number of Flutes 2 Minimum Bore Diameter 18 Millimeters Surface Recommendation Metal, Plastic, Wood