Description Synthetic Rope Thimble Galvanized ST Type The Synthetic Rope Thimble provides a new dimension in light weight heavy-duty rope thimbles with this improved design for use in the marine towing industry. Light enough for easy handling, but with the maximum strength at critical points. The generous inside dimensions allow these thimbles to fit any large towing shackle or any large regular shackle. For use with all types of synthetic rope. Larger sizes have rope retaining rings. Injection molded from tough, wear-resistant polyallomer material. Ideal for use with lanyards, hand lines, mooring lines. Commonly used in the commercial marine industry, these thimbles are an excellent choice for spring lines and mooring lines.