1. The screw is made of copper, with the surface of white plating, wear-resistant and durable. 2. Its inside diameter is 1/4”, the outside diameter is 3/8”, the height is 7mm. 3. It can convert 1/4” to 3/8” or 3/8” to 1/4” mutually, suitable for a variety of tripods, ball heads, light stands and flash bracket |