A lot of people use the V-Lock to mount the grill on the boat. Pontoon boats typically have square railings of 1 1/4".Here is a great example of how the V-Lock square rail kit works. Done using the grill? Simply pull the pin and remove it.Put something else in its place, never enough cup holders in the boat! Good idea to install the V-Lock around a stantion, or post for extra support and stability.