Replace your Scout Light’s rear push-button cap assembly with this cap in order to attach a SureFire tape switch. Lock-out feature positively prevents activation during tactical operations” transportation” or storage. Made from aerospace aluminum” MilSpec Type III hard-anodized. Available in Black or Desert Tan. Fits: Scout Light Weapon Lights; Flashlights with .75″ diameter switch” including” E1E-HA” E1B” E1L-HA-WH” E2D-BK” E2DL-BK” E2L-HA-WH” L4-HA-WH