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The 90 degree tube connector with stub is a mini-clamp connector with a bore and a zinc plated steel stub shaft. The bore is round with broached corners, allowing it to fit both round and square tubes. The clamp attachment comes with a standard socket head cap screw or can be substituted for a clamping lever kit. The stub shaft is affixed to the connector with a socket set screw. 90 degree tube connectors are available in aluminum with a plain or black anodized finish.