The seat rail guide for fixed 7/8" tube armrests used on manual wheelchairs supports and connects the seat frame tubes to the back frame tubes. This black plastic part keeps the chair lightweight as it negates the need for heavy welded steel framing.
Note: The 7/8" dimension refers to the external diameter of both the U-shaped support and the tubing size which fits over the black plastic shaft. The shaft part is actually 3/4" in diameter and fits inside of a 7/8" tube.
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