To firmly hold your tablet or ipad from 33 cm to 50 cm use this extendable and lockable aluminum strip. Inside it has a large thread with two 1/4 screw entries, a 3/8 screw entry and an anchor for Arca Swiss type universal shoe. It can be placed directly on a ball joint with this anchor. To expand the Leofoto IPC500 terminal strip, simply turn the lower thread. Turn counterclockwise to lock. At the ends it has non-slip silicone with anti-fall edging edges. Looking at its bottom, at one end, it has a 1/4 screw input. This will serve to place the strip by using an articulated arm or clamp in the position that is needed.