Professional Tripod Boom Arm Aluminum Alloy horizontal tripod arm can be used as an extra center column to increase the shooting height with 28mm-diameter pipe, durable and solid. Length up to 16.5in / 42cm. Knob-type locking system, easy to operate; 360° Rotation with Rotating Basesupports 360° panorama shots and 180° vertical adjustment to be a jib arm for overhead photography. Hold your camera at your preferred height and angle. Perfect for studio indoor/outdoor macro shooting and low angle shooting Wide Compatibility Equipped with a double threaded screw adapter (1/4' and 3/8'), the tripod extension arm is compatible with most DSLR cameras, camcorders or ball heads. It can be mounted on most tripods with the standard 3/8' hole at the bottom of the rotating base. With a Extra Detachable Extender This upgraded horizontal tripod arm comes with a detachable extender,with cold shoe interfaces and 1/4' screw holes for more accessories at the same time to meet all your expansion n