The Two Way Arm has two location holes which will allow the fitting of, for example, a thread stikk and feeder arm on the one arm. It is ideal if you wished to have a rod rest and keepnet fitted to the one arm. It easily slots on or off the main StarGrip fitting. It will only work if you have first purchased a universal arm (item 20510) or a Kodex chair like the Robo, Kushy or Serenity.