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The 90° Midrail Corner or A20 is used for the middle or lower rail of a guardrail structures. It enables the formation of a 90° corner or ‘elbow’ by joining two horizontal tubes which fit into each side of the key clamp, with one vertical tube fitting through it. These tubes should be Size 7 and have a 42.4mm outside diameter. A Three Way 90° Elbow (A18) fitting should be used for creating corner joints within the top tubes (rails) of structures.