The ClearSpan Glazing Box differes from the bar, in that it is attached to a rectangular hollow section rafter, as you can see from the illustrations. 

Each ClearSpan Glazing Box assembly includes the top cap, base box-bar, top cap infill, rubber seals, 2x end-plates w/screws, compression screws and is supplied in either mill finish (natural aluminium) or powdercoat finish.  These glazing bars are typically attached to a supporting structure using either the 100mm Saddle Brackets, 50mm Hanger Brackets or the 5-degree internal bracket.  The glazing bars come in lengths of 4050 or 6050mm. 

Please choose from the Duralloy Solid Colour Range to find a colour that suits.  Scroll down to the bottom of the Duralloy Solid Colour page to see the corresponding colours to the dropdown choices above.