The Vetro style is a classified as a semi-frameless glass balustrade since there is no top rail to run across the top of the glass infill. The recessed channels down each aluminium post allow the support for this style to be crisp clean lines across the top while being significantly more economical. Being a very popular specifiers' choice, the combination of no top rail to interrupt a view, but with the added support of aluminium posts at each of the regularly spaced intervals is a very reliable combination of minimal aluminium use with glass.