The wall mounting boom arm is made of metal material, making it strong for heavy duty work. Maximum load capacity is up to 8.8 pounds/4kg. Length is adjustable from 15 inches/38 centimeter to 23.6 inches/60 centimeters; Light weight and can be folded, making it portable and easy to store Equipped with 1/4 inch to 3/8 inch adapter screws to fit for mounting most mainstream video light The base comes with 4 pieces hole helping mount the boom arm on the wall and ceiling which saving a lot of time and space Hold your lights to the ceiling or wall, makes your studio look professional and organized; Note: The monolight is not included