Nitecore GM02 Pro is constructed from aero-grade aluminIum alloy with HA III military-grade hard-anodised finish for rugged durability. A large stainless steel thumb nut alloys for easy adjustment and ensures stable mounting on a Picatinny rail. It can fit torches with a body diameter of 25.8mm-26.5mm and fits models like the Nitecore SRT7i, SRT6i, MH12 Pro, and MH25 Pro.