This is the core of the StarGrip360 system. It will allow you to affix StarGrip360 technology to the leg of a seat box or chair. It will fit many makes of seat box including those with round (25mm), octagonal and square (20mm) legs, and will also fit onto chairs with 25mm round legs (which is most fishing chairs on the market). Once fitted you can then customise your set-up further by buying additional accessories separately, like a StarGrip360 feeder arm or extension arm.15