This is a single Manfrotto Black Autopole Extension. Use tit as a background crossbar with the Super Clamp and U-Hook set, or extend the height of your Autopole 78" (2 m).
Use this 40mm diameter aluminum pole as an Auto Pole extension, as a crossbar or boom arm on its own.

Dimensions 78.74 x 1.57" (2 m x 40mm) (LxDia)
Weight 1.52 lbs (681g)