Fenix Picatinny Rail Tactical Flashlight Ring ALG-01

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, With Plastic Spacer: Fits Flashlight Diameter .93 inches to .95 inches (23.6 mm to 24.2 mm), Without Plastic Spacer: Fits Flashlight Diameter 1 inch to 1.02 inches (25.4 mm to 26.0 mm)