Bootstrap Farmer Spring Wire & Lock Channel - Greenhouse Spring Lock & U-Channel Bundle, 4 of Each, Greenhouse Plastic or Shade Cloth Attachment High-quality, rust and maintenance-free Aluminum Alloy Lock Channel AND PVC coated Spring Wire. 6.5 ft. in length each Tightly secures poly film or shade cloth (up to 20 mil thick) to your greenhouse with minimal effort Easily attaches to frames, baseboards and hip boards. Will bend to the arch of your tunnel Mounts to all wood or steel structures. Pre-drilling or self-tapping screws recommended 1.25"W, 0.5"H, 1/16" thick profile, inside of channel 1.125". Spring Wire 6.5 ft of PVC coated steel Each piece is 6.5 feet in length<br> Width of 1.25&#034; provides superior hold<br> Channel profile is 0.5&#034; thick which is very durable yet provides flexibility for bending over arches<br> Wire lock is 1/16&#034; thick which is strong enough for very secure bond but workable for easy installation Perfect for attaching poly film (polyethylene plastic)<br> Greenhouse Shade Cloth<br> Any other greenhouse covering up to 20 mil thick Made of Rust and Maintenance Free Aluminum Alloy<br> Bendable to be abled to fit contours of your greenhouse<br> Allows for easy pre-drilling or self tapping screws for faster installation Protective Coating provides superior longevity<br> Improved bendability for faster and easier installation<br> Less prone to tearing Greenhouse Plastic<br> Forgiving on your hands<br> Easy to wiggle in and out of channel lock