Bootstrap Farmer Lock Channel for Greenhouse Spring Wire U-Channel, 10 Pack, for Plastic Poly Film and Shade Cloth Attachment Carefully constructed, high-quality, rust and maintenance-free aluminum alloy 6.5 ft. in length. Tightly secures poly film or shade cloth (up to 20 mil thick) to your greenhouse with little effort Mounts to all wood or steel structures. Pre-drilling recommended or self-tapping screws recommended Bendable to fit the arch of your tunnel 1.25"W, 0.5"H, 1/16" thick profile, inside of channel is 1.125" Spring Wire and screws not included Each piece is 6.5 feet in length Width of 1.25&#034; provides superior hold Channel profile is 0.5&#034; thick which is very durable yet provides flexibility for bending over arches Perfect for attaching poly film (polyethylene plastic) Greenhouse Shade Cloth Any other greenhouse covering up to 20 mil thick Made of Rust and Maintenance Free Aluminum Alloy Bendable to be abled to fit contours of your greenhouse Allows for easy pre-drilling or self tapping screws for faster installation