This is the starter kit for the StarGrip360 system and should be purchased before buying any StarGrip360 extras like thread sticks or feeder arms. It rotates 360 degrees in two directions, so that you can set-up your fishing station exactly how you like it. This kit includes an insert that allows you to affix an umbrella. The StarGrip360 starter arm will fit onto most round-leg fishing chairs (up to 25mm diameter) and comes with inserts to fit various diameter legs. It also comes with grip-blocks which allow it to be used with some square or octagonal legs found on seatboxes. You just heat it up to make it ready to affix to your chair or box, and you can then add so many accessories like a thread stick, straight feeder arm, periscope feeder arm, a one-way arm or a two-way arm. From there you can add rod rests, mini rollers, pole grip rests, bait trays, pole-socks and more, and set them up in lots of configurations. It's a great system and an original concept by Middy, which was first launched in 2008 and has thus far stood the test of time. Please note that if you want to add the StarGrip360 system to multiple chair legs you will need to buy multiple starter kits - each starter kit is designed for one leg only.