The CenFlex 5" Flexible Rail Bracket is an integral part of the Cenflex fencing system; if you're installing a Cenflex fence, you'll need a few of these rail brackets to keep the fence rail against the poles. Fortunately, the CenFlex fencing brackets are some of the strongest in the industry, featuring stability-disc technology to prevent sliding. They also are steel bar reinforced for unparalleled strength, so you can have peace of mind, knowing you've received the best product available for your fence.