End Cover is used to cover tension lock hole, such as Z981, for all beam extrusion with lock chamber 21X12mm, eccenter dia 13mm. It is made of PVC materials and weighs 0.0005 kilograms.  It has round shape and can be perfectly inserted into the tension lock hole, the diagram is 4.2mm. When the hole is covered, the beam becomes more integrated and flatter. If you have the demand for End Cover, LingTong will provide the component separately or on the extrusion and send them for you together.