The CRL Key Removable Mullion can be removed in seconds with one key turn, and easily snaps back into place without needing the key. The installation is easy (no drilling of the mullion tube), and can be adapted to any double door application. You can cut to fit almost any size application 8' (2.14 m) and smaller. The CRL Key Removable Mullion is designed for heavy-duty use on rim exit devices on standard and fire rated pairs of doors. The Mullion comes with a small profile base plate to prevent interference when moving objects through doorways. Hardware includes shims to ensure an accurate fit and base anchors.