Check the listing for details. THYRM / COSTA SwitchBack S Universal Fits Surefire EB1 EB2 EDCL1T EDCL2T E1B MAX. Condition: New with tags. Listed at 21.95 USD. WE OFFER SUPER FAST & FREE 50 STATE SHIPPING & HAVE EXCELLENT FEEDBACK !!! Thanks for visiting ROCK MOUNTAIN TACTICAL ! We are Authorized Full Line dealers for several high quality brands like: Magpul, Ajax Grips, Viking Tactics, ODIN Works, GG&G, Eberlestock, Emerson Knives, Savvy Sniper Slings, Impact Weapons Components (IWC), Wilson Combat & many other excellent name brands. We have 1000s of items in stock: all types of parts and other gear. Please Visit our eBay Store at Rock Mountain Tactical - since 2006. On Time. On Target. NEVER QUIT !!! *** We are authorized THYRM dealers since the beginning. Beware of unscrupulous sellers on the net offering fakes / counterfeits of THYRM products. *** Make sure you are buying from an authorized THYRM dealer so you get the real, genuine item that is made to last...not cheap, fake junk !!!*** PLEASE MAKE SURE you buy the right size for your light. We do not refund our initial shipping costs if YOU order the WRONG part for your application !!! *** IF YOU DON'T KNOW, then ASK QUESTIONS first before ordering !!!!!!!! THYRM SwitchBack S "UNIVERSAL" Backup Flashlight Ring - The SwitchBack 'S' Backup Flashlight Ring turns your Surefire compact flashlight into a flexible tactical tool. Thyrm has improved on their original design to fit the latest “EDC” models, while remaining compatible with most Surefire E-Series legacy Backup flashlights. *** See Compatibility Table below for fitting details *** Description: The SwitchBack 'S' Backup Flashlight Ring enhances your compact flashlight, optimizing ergonomics for searching & shooting.Securely mounts between the tailcap and body of the flashlight.Rigid retention ring helps reliably deploy and index flashlight from both pockets and pouches.Shoot using a natural two-handed grip (the SwitchBack Technique).Employ all traditional low-light techniques such as Neck Index, Modified FBI, and Harries.Positively retain the light when drawing a firearm, reloading, and malfunction clearance. Designed in collaboration with Chris Costa, Costa Ludus. The SwitchBack S Backup comes with two o-rings. See below for compatible lights and recommended o-ring to use. *** Please take note of the "THYRM Compatibilty Chart" for compatible flashlights in our images or below !!! ***