Mullions For use in a multitude of applications, SARGENT mullions are offered in aluminum, steel and electrified options. 988 Surface Bolt Kit 12-HD980 Heavy Duty Steel Mullion 650A Removable Mullion EL980 Electrified Keyed Removable Mullion 980 & 980A Removeable Mullions 980S & 12-980 Removeable Mullions HC980 & 12-HC980 Removable Mullions HC-L980 & 12-HCL980 Keyed Removable Mullions L980 & L980A Keyed Removable Mullions L980S 12-L980 Keyed Removable Mullions