Mounts onto 30mm/1 optic or accessory straight to your KeyMod mount platform. Great for 30mm reflex optics, magnifiers, flashlights, and lasers. Light weight by design that won't effect the weight of the airsoft gun. Constructed out of aluminum alloy for extra durability. Ring centerline height is 1 above the mounting surface of the KeyMod. Easy installation. In the Box 1X 30mm KeyMod Ring Mount Specifications: California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov