Designed for market gardeners, commercial tunnel operators, and homestead growers tackling large-scale poly-film installs, this 50-pack of 6.56 ft. spring wire and U-channel sets delivers roughly 328 ft. of film fastening, enough to finish commercial high tunnels, 20 x 48 ft. propagation houses, and multi-bay caterpillar tunnels in a single order without mid-project trips back to the supplier. The polyethylene coating shields the steel spring wire from rust, UV bleaching, and fertilizer overspray that quickly kill uncoated galvanized wire, keeping clamping force strong across multiple growing seasons rather than failing at the first hard January storm. Snap the spring wire firmly into the U-channel over your poly film, shade cloth, or insect mesh for a tool-free lock that sheds wind-driven rain, heavy snow, and summer heat waves without loose flapping or staple damage along the rail. The reopenable design lets commercial growers lift the spring to swap seasonal covers, patch torn panels, or layer shade cloth over the primary film without cutting away the previous install, a genuine labor saver on spring-to-fall rotations. Fits standard 1 in. and 1-3/8 in. hoops on commercial tunnel kits and DIY hoop houses. Material: Aluminum.