Material: Marine Grade 304 Stainless Steel Polished finished, Corrosion resistance, Durable and lightweight Perfect for many marine and industrial applications Color: Silver Size: M4 / M5 / M6 / M8 / M10 / M12 Size Chart: M4 Thread Outer Diameter: Approx. 0.4 cm / 0.16 inch Total Length x Thread Length: Approx. 5.3 x 3.3 cm / 2.09 x 1.3 inch Hook Opened: Approx. 0.65 cm / 0.26 inch M5 Thread Outer Diameter: Approx. 0.5 cm / 0.2 inch Total Length x Thread Length: Approx. 5.9 x 3.4 cm / 2.32 x 1.34 inch Hook Opened: Approx. 0.65 cm / 0.26 inch M6 Thread Outer Diameter: Approx. 0.6 cm / 0.24 inch Total Length x Thread Length: Approx. 7.6 x 4.6 cm / 3 x 1.81 inch Hook Opened: Approx. 0.8 cm / 0.31 inch M8 Thread Outer Diameter: Approx. 0.8 cm / 0.31 inch Total Length x Thread Length: Approx. 9.7 x 6 cm / 3.82 x 2.36 inch Hook Opened: Approx. 1 cm / 0.4 inch M10 Thread Outer Diameter: Approx. 1 cm / 0.4 inch Total Length x Thread Length: Approx. 12 x 7.5 cm / 4.72 x 2.95 inch Hook Opened: Approx. 1.3 cm / 0.51 inch M12 Thread Outer Diameter: Approx. 1.2 cm / 0.47 inch Total Length x Thread Length: Approx. 14.6 x 9.7 cm / 5.75 x 3.82 inch Hook Opened: Approx. 1.6 cm / 0.63 inch Package Includes: 1 Piece Hook Bolt Note: Due to the differences between different monitors, the picture may not reflect the actual color. There is 2-3% difference according to manual measurement, please check the size carefully before you buy the item.