Manfrotto 823 Medium Hydro Arm, 823 Medium Hydro Arm. This is the first arm that features 5/8" and 1/4" pins to support larger and heavier items. One of the two pins is hex shaped to merry perfectly with our superclamp. With a total length of 23,5 cm, the 823 is ideal to position lighting fixtures or cameras virtually anywhere. To ensure that all three feet make Contact with the ground on any terrain. SPECIFICATIONS: attaches by: 1/4" female thread attachment type, attachment (top): 5/8" male attachment type,, closed length: 14.4 cm, Color: black color, material: aluminum, maximum length: 23.5 cm, safety payload: 4 kg, weight: 0.55 kg