The barbs keep the mounts in their places; other wire useful in greenhouses is the type sold for electric fences, cheap and rust resistant; galvanized clothes line is useful and can be straightened out with an electric drill A86-571 See also STAKES
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WIRE: How to Straighten It
Cut off desired length from a roll, fix one end to a base and attach the other end in the bit of an electric drill, hold the wire taut, allow drill to turn a second or two. A69-884