About this item 【Parameter】- Material:HSS-6542;Hardened to:65-66Hrc;Cutting Diameter:27.5mm/1.08inch;Shank diameter:12.7mm/0.5inch;Total Length:150mm/5.91inch 【Material】- High speed steel 6542 is designed to ensure sharp and fast execution in metal surface for clean results;27.5mm cutting diameter. Good for most general purpose applications, featuring a combination of hardness and toughness for wear resistance 【Advantage】-Expanding the size range capacity of a portable drill chuck; Common flute and overall length for minimal adjustment during tool changes 【Special Design】-Black oxide treatment adds lubricity; Small pockets on the surface of the tool that act to hold coolant near the cutting edge 【Wide Applications】- Design for drilling in low and medium tensile strength materials; such aluminum; iron; copper; brass and metal