A 90° corner elbow consists of two separate pieces, 515-7T and 515-7B, which are joined by a centrally positioned screw. The combined fitting is positioned with the ends inside the adjoining handrails, and the outer grubscrews are tightened. This forces the halves apart, gripping the inside of the tube. The central screw is then tightened, locking the fitting in place.

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