The 83L Rigid Mount is a hard-mounted system designed to be able to mount an 83L Rugged Case to your roof rack or anything with mounting capability. Its design allows the mount to shoehorn into the tie-down channels of the 83L Rugged Case and has 1/4" holes to bolt down to your rack or flat surface. The mounts are .188 black powder-coated steel. *Mounting hardware not included*