Featuring the same enhanced features as the SwitchBack® 2.0, the SwitchBack DF Flashlight Ring is the ergonomic upgrade your larger diameter SureFire Dual Fuel* tactical flashlight deserves! It features a larger opening to accept the Dual Fuel’s tailcap, and includes an additional lock to ensure it stays in place during hard use. The SwitchBack DF Flashlight Ring has an inner diameter of 1.12 inches, so it can fit tailcaps of this size on some larger lights (see compatibility guide). (*It is NOT COMPATIBLE with the DF Turbo, EDC1-DFT, and EDC2-DFT SureFire lights. The SwitchBack 3.0 EDC-DFT can be found here.) Thyrm offers 8 Flashlight Ring models including the SwitchBack and the Low Profile Carry Clip. Enter your flashlight make and model in the finder below to find a compatible model. Installation can vary depending on your light make and model. Use our Installation Guide to get specific guidance for your light. For installation: Unlock the release ring and hold it below the latch on the tube of the SwitchBack; this will deflect the upper locking finger of the tube’s channel. Insert the tailcap until it’s seated at the bottom of the SwitchBack DF’s tube. Reattach the ring to the latch on the tube: This will capture the tailcap within the SwitchBack DF; you can press the top end of it against the tailcap to help seat it. No additional washers or o-rings are needed for installation, but the SureFire o-ring should stay on the light. Note: You do not need to remove the tailcap from the SwitchBack during battery changes. Caution: When changing batteries, be sure to carefully align the tailcap and body of the flashlight and screw down the tailcap without dislodging the sealing o-ring on the body of the flashlight. This alignment is shown in the video below.