This is the core of the system. It will allow you to affix StarGrip technology to the leg of a seat box or chair. It will fit many makes of seat box including those with round, octagonal and square legs, it will also fit onto chairs with 25mm round legs. Once fitted you can then customise your set-up further by buying additional accessories like the feeder (item 20512) or long/ext arm (item 20516) from the range.