Head Type: Hex Material: Steel Measurement: Metric Plating: Corrosion-Retardent Zinc Tolerance: ISO 965 Standard Quantity: 40 pieces Note: It does not include other things, the color is based on the first picture, and the other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thanks!