The Manfrotto 131DD Tripod Accessory Arm for Four Heads mounts onto the center column of tripods with 3/8" threads. The platforms feature 3/8" screws, which allows a standard tripod head to be mounted on either or both sides. In addition, the horizontal bar features 3/8" screws on both ends, allowing mounting of tripod heads from the sides. Replaces part number 3153.
Horizontal Arm Travel: 12" (30.7cm)
Length: 23.6" (60cm)
Weight: 2.4 lbs (1.1kg)
Package Weight: 3.6 lb
Box Dimensions (LxWxH): 24.4 x 4.25 x 3.2"