Fenix ALG-01 Features: -Weight: 51 grams (excluding Allen wrench) -Material: Flashlight Ring Aluminum, type 6063TS. Plastic SpacerPOM -Hex Screw: Steel, type 22 -Allen Wrench: Steel, type 45 -Precision Machined Aluminum with Anodized Black Matte Finish -Mounting Base Designed with Locking Hex Screws to Fit on Picatinny/Weaver Rail -Clever Adjustable Diameter Designed to Allow for Use with a Wide Range of Flashlights -Universal Slide-on Flashlight Ring This bundle includes EdisonBright BBX3 battery carry case.