The Fenix AGL-01 Flashlight Ring Weapons mount is precision machined aluminum with anodized black matte finish. This mounting base is designed with locking hex screws to fit on Picatinny/Weaver rails. Clever adjustable diameter design to allow for use with a wide range of flashlights. Using the included spacer, will fit flashlight diameters from 23.6mm ro 24.2mm (compatible with the FXPD32) Without spacer, fits flashlight diameters from 25.4mm to 26mm (compatable with FXTK11, FXTK12, FXTK15, FXTK21, FXTA20, and FXTA21) Weight: 51gm (excluding spanner)