In the glass and window industry, all parties involved have been able to agree on a common standard, which is good, otherwise everyone would have a different color for a different size. In the hectic daily routine, in window production or assembly, there is usually no time for searching. So the different bars were assigned fixed colors. 1mm bar ñ white 2mm bar ñ blue 3mm bar ñ red 4mm bar ñ yellow 5mm bar ñ green 6mm bar -black.