Introducing the FatBoy Tripods MLok Arca Rail Mount. Designed and manufactured in the USA, the MLok Arca Rail Mount is made with high-quality locally sourced resources. The Fatboy Tripods MLOK plate is designed to be mounted to (1.5”/38mm) Arca-Swiss tripod clamps. A high-quality lightweight solution for mounting a rifle or spotting scope cage to a tripod. Lifetime warranty on all of our products.