All Rollei tripods are equipped with a 1/4" Thread on the tripod shoulder for quick and easy mounting of additional equipment. Also known as the "third arm", the Rollei articulated tripod allows you to mount your smartphone, actioncam (using the adapter supplied) or many other items on the standard 1/4"" tripod. connection within immediate reach or to align it directly with your subject. Behind-the-scene shots or a second image perspective can be easily achieved with this useful and practical accessory without having to carry a second tripod. After the exact alignment of the joint tripod, fix the position with the large and handy locking screw on the main joint. One 1/4"" each Connection at the end of each articulated arm ensures that you can connect your Rollei articulated tripod to countless photo equipment parts. You can fix control monitors, video lights, flash units, microphones, tablets, etc. with a maximum weight of 1 kg at the desired angle in a stable and safe way in no time at all.