Thimbles for hemp ropes是什么？

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Hull fittings as stated below to be galvanized or to be of galvanized sheet.
•        Handrail top
•        Life boats stowing and lashing fittings(where with wood ropes)
•        Thimbles for hemp ropes
•        Steel fittings in ref. provision store
•        Other equipment which to be mentioned to be galvanized in the specification