Schaefer Flat Base Delrin Single Cheek Block / BB 1 7/16 in. (37 mm) Dia. Sheave
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Flat, stainless base plate distributes loads to a larger surface area than other designs that place loads on mounting bolts only. Use on spars and deck to lead sheets, halyards, reefing gear, and any control requiring a strong, smooth lead.
Ball Bearing Flat Base Cheek Block. Max line 7/16", Safe Working Load 1000 lbs.