INTERFACE: Surefire Scout Light / Streamlight ProTac Rail Mount Light / Ring Light Mount / Offset Rail / Millennium Adapter FUSION(TM) is a modular, multi-purpose mount designed to give the end user extreme flexibility in mounting options. It was engineered from the ground up to provide a strong mounting base with the widest range of configurations while remaining lightweight and low profile. Material: 6061-T6 Aluminum Finish: Type 3 Hardcoat Anodized Mfg: Unity Tactical