Square Line Rail Clamps, also known as Boulevard Clamps, attach two horizontal chain link fence rails together. The fence post then inserts into the center of the clamp, establishing a T-shaped connection for stability. They're made of steel, which means they not only look good, but they're also built to withstand the demands and impacts of any application. With multiple sizes available, we have the line rail clamps to fit the needs of a litany of applications.