METRO Glass Products believes you know how to spend your time on site better than we do. Assembling parts on site could be time better spent installing – that’s why we send our frames and doors out prefabricated. Who do you want deciding what happens on your site – the aluminum supplier sending out bundles of parts that require wasting precious time assembling or you, by arriving at the site and starting to install? Assembling the parts and pieces is far more accurate in a climate controlled shop. Vs out in the elements. Our prefab system saves you about 50 percent of the install time needed on site. This combined with the accuracy shop controlled assembly jigs.