D-Shackle with Roulette Thimble (TYPE D18) The D18 series represents a sophisticated engineering solution for high-capacity mooring and heavy-lift operations. By integrating a high-strength D-shackle with a specialized roulette thimble, these components provide a critical interface that maximizes the service life of both wire and synthetic ropes while ensuring structural integrity under massive loads. This series is DNV GL Type Approved (Standard OS E302), confirming its compliance with the most rigorous safety standards for the offshore and maritime industries.