Used for tunnel greenhouse and freestanding greenhouse construction, mainly used as a cross connection for purlin and bow connection, it is made of galvanized steel wire, with heat treatment, Capacitance paint, it is flexible and can be used repeatedly, customized size is available too. Can be used for 20mm, 22mm, 25mm, and 32mm round tube connections. We supply many sizes of clip spring for a greenhouse, custom size is acceptable in Atlas metal.