The SkyWatcher extension brackets allow you to raise the height of the mechanics on the EQ5/HEQ5 and EQ6/EQ-6R. They are of importance when the height of the factory tripod is insufficient when using your telescope. In this case, the extension piece is fitted on top of the tripod and the mechanism head is mounted on the extension piece.
The EQ-6/EQ-6R extension is 22 cm long, the EQ-5/HEQ-5 is 40 cm long and weighs 5 kg, the Staradventurer pole is 21.5 cm long and weighs 0.9 kg.