The exit doors to your building should have the best parts to ensure durability and protection. LCN has been manufacturing some of the best door parts and accessories since 1926 and we offer a full line of LCN commercial drop plates. Drop plates are an ideal solution when the frame of the door or the stile around the door is too narrow. By mounting your door closer on these plates you open up the option to install a heavier duty closer. Since 1970 RBA Door has been supplying the best commercial door parts there are to offer on the market.