Thyrm Switchback Flashlight Ring The Large SwitchBack can be mounted on many 1 inch diameter flashlights, see compatibility chart image for specific models. Reliably deploy and index flashlight from both pockets and pouches, using the SwitchBacks rigid retention ring. Shoot using a natural two-handed grip (the SwitchBack Technique). Positively retain the light when drawing a firearm, reloading, and clearing a malfunction.