Check the listing for details. 17mm HSS 6542 Reduced Shank Drill Bit Black Oxide. Condition: New. Listed at 15.34 USD. Reduced Shank Drill Bit Description:High Speed Steel tool - 17mm cutting diameter. Good for most general purpose applications, featuring a combination of hardness and toughness for wear resistanceReduced Shank - Expanding the size range capacity of a portable drill chuck. Common flute and overall length for minimal adjustment during tool changesBlack Oxide Finish - Black oxide treatment adds lubricity. Small pockets on the surface of the tool that act to hold coolant near the cutting edgeWide Application - Design for drilling in low and medium tensile strength materials, such aluminum, iron, copper, brass and metalPlease Note: To make clean and precise holes, water is required for lubrication and cooling when drilling metals. Increased use of water lubrication will extend drill bit life.