Profile: Steel Window Service and Supplies Ltd specializes in the supply & fix, servicing, repair and replacement of steel windows. Our C55 is a commercial-standard steel door screen system constructed from cold-rolled box section steel (as opposed to mild rolled steel used on other ranges). A large range of ironmongery can be fitted and the system includes matching sections for top / side hung opening windows for use as fan or side lights. This range is suitable, via its steel clip on beads, for fire rated applications. It is an ideal replacement for failing entrance doors and also as a product suitable for modern new builds.