Wire Lock is great for the tops; Wire Lock can also be used on the ends. Wire Lock can be used around bows, Wire Lock can also go straight down the side. Wire Lock works for single layers or multi layers of Greenhouse Coverings. You can put the plastic on and go back with a second layer like the shade cloth all in the same Wire Lock base. The price is for one eight ft length. It includes the base and one wire. Extra Wire Lock is available for $1.85 each. The Wire Lock and Aluminum Base is sold in 8' lengths.