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60' per order (10 lengths of 6') Springlock is used to attach poly to greenhouse frames. The steel channel is double coated (zinc and manganese) for excellent durability. Unlike aluminum, the base bends easily over end arches, and the rounded bottom fits well to round structural members. Product does not interlock. The channel accepts 3 spring - very useful for attaching end wall poly or shade cloth. The channel holds up to 4 layers of 6 mil poly.