The Pro Plug system for PVC is a superior connection system for PVC roof and trim.It combines thread strength with the beauty of a hidden locking system.Install in 2 simple steps.Tighten the screw with the PVC Pro Plug tool and tap on the PVC plug with a hammer.The Pro Plug PVC plugs are made of original PVC material so they are a perfect complement to your PVC cover and trim Pro Plug PVC Fixing tools to the correct depth every time.Automatic shutdown without exit prevents them from slipping.