FATBOY ARCA PLATE M-LOK The FatBoy Tripods M-Lok Arca Rail Mount is a high-quality, locally-sourced solution for attaching a rifle or spotting scope cage to your tripod. Designed and manufactured in the USA, the M-Lok Arca Rail Mount is made with the finest materials and is designed to be mounted to 1.5"/38mm Arca-Swiss tripod clamps. Try it out for yourself and experience the convenience and versatility of the FatBoy M-Lok Arca Rail Mount Specifications: Length 5" Width 1.5" Catch Stop 3/32"