Description: Material: 4241 high speed steel Color: golden tone (as pictures show) Perfect for drilling shallow or deep holes in wood and board materials. A great helper for the carpenter. 4-12mm Ladder Drill Bit: Can drill a hole with diameter of 4, 6, 8, 10, 12mm Overall Length: 63.5mm/ 2.5 inches Shank Size: 6x21mm/ 0.24" x 0.83"( D * T) Shank: 6mm triangular shank 4241 high speed steel is suitable for use in the workpiece with hardness 25 degrees below, such as iron, aluminum plate, PV plate, insulation plate. Surface Treatment: Titanium CoatedQuantity: 1PC Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Compare the detail sizes with yours, please allow 1-4CM differs due to manual measurement, thanks! Package Included:1 x Step Drill Bit