IRWIN INDUSTRIAL TOOL 12412 Countersink, 5/8" Product Description High speed steel with black oxide coating for corrosion resistance. 5 flute design reduces vibration for smoother drilling. Precision-ground 82 deg (Degree) tip for countersinking into most Machin able metals. 1/4" Round shank compatible with all hand Held and stationary drills. From the Manufacturer High Speed Steel Countersinks, 5/8-inch diameter, milled and precision ground to countersink into any machinable material including iron, steel, soft metals, plastics or wood. Irwin tools are made of only the finest materials, manufactured to exacting tolerances. Features High speed steel with Black oxide coating for corrosion resistance 5 Flute design reduces vibration for smoother drilling Precision-ground 82 deg (Degree) tip for countersinking into most Machin able metals 5/8", high speed steel Milled and precision ground to countersink into any machinable material USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.