aluminum alloy, with high hardness, good heat resistance, wear resistance and resistance, light to carry, not easy to rust, not easy to damage 7 standard for your option: 3 / 8 female to 1 / 4 male, 1 / 4 female to 3 / 8 male, 1 / 4 female to 1 / 4 male, 3 / 8 female to 3 / 8 male, 3 / 8 male to 1 / 4 male, 1 / 4 male to 1 / 4 male, 3 / 8 male to 3 / 8 male Better structure design, very for one-handed use.It can be disassembled easily Thread screw adapter color is Black, knurled finish provides excellent grip,, and without burrs, complete thread, and stable Suitable for tripods, cameras tripod, tripod heads, ball heads, Manufacturer: MHADBKH