Anodising Aluminium results in a very hard surface finish that is long lasting and easy to maitain. Issues such as 'tea staining' are not applicable with an anodised finish.
 
Alloy 6063-T6 Aluminium - superior anodised finish
Solid extruded aluminium with machining
Tapered top to comply with 'no toe hold' requirements 
Patented double friction technology allows for easy tilt adjustment and alignment of frameless glass panels
M16 bolt at bottom enables up to 60mm of vertical height adjustment, a contact point for earthing, and extra anchoring in footings (helpful when working with sand)
Tea staining issues are not applicable with an anodised finish