Center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Captive Delrin® ball bearings carry side loads.
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Set screw allows shackle to be fixed or to swivel.
Quick disassembly with hex wrench; minimal number of fasteners; no loose balls or rollers.
Side plates made of aluminum hard-cote anodized for durability and to stay looking as black as their name for years. All the time doing the strength/responsiveness magic we designed into them.