1/4 Screws and Horizontal Column The HOZIRONTAL COLUMN is hidden in the central column, you need to loosen the knob and pull it out to useThe HORIZONTAL COLUMN is not a separate accessory This product has three 1/4 standard screws allowing you fix three devices at the same time. It is suitable for phone holder/Gopro/ringlight. You can put havey objects in the carry bag which is comes with tripod and hang it on the column for reinforcement and use removable extension clip to stop the bag from sliding down. A little tip: To protect your devices, devices should not be too heavy. Adjustable Height: This 67" adjustable horizontal tripod has four-section column legs which equipped with three quick flick locks allowing you to easily adjust the working height from 18.5" up to 67" in a few seconds. In the middle tube, the lower rubber stopper can be removed to disassemble the tripod into a monopod to selfie. Knob locking method is more sturdy. The storage height is o