For this Slider You Will need Two 16mm Thick Aluminium Bars 4 Feet Long or Longer
4 Bars Holders, And 4 Sliders
The Bars Need to be polish so there are No marks on them
The Sliders are adjustable so they Move freely across.
The Top Plate Could be made with Metal. But i have used PVC
It Hold My DSLR and A Ball Head With No Problem.
Hope You like it.