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Exclusively sold by GRELWT - a long lasting and easy way to install your greenhouse covering. PVC Coated Spring Wire and Aluminum Lock Channel will help to ensure that your greenhouse can weather the elements and last for years. Unlike other attachment methods, Lock Channel and Wire will hold up to high winds and harsh environments. Protect your investments by using the right products. The PVC Coated Spring Wire and Lock channel method prevents tears during and after installation. The PVC Coated Wire is the superior choice compared to the non-coated spring wire version. The PVC coating prevents tears and is easier to handle. It is reusable and can easily be installed and removed by “wiggling” it in and out of the Lock Channel.