Hard anodizing has a high-tech and fashionable appearance as well as offering superior resistance to sea water corrosion. Our research into cleat materials over the years has shown aluminum to be far better for high performance cleats than any polymer, irrespective of any fiber reinforcement or additive. These factors make aluminum cleats the best choice for demanding applications.Most cleats are provided with countersunk fixing holes. Flathead screws or bolts of the recommended size should be used; bolts being preferred. If using rivets with a powered fixing gun, make sure the pressure is not set too high. Fastenings must be entered straight so that the heads do not protrude to snag the rope. Several of the cleats have been designed with a groove in the base enabling them to be fitted to both flat and curved surfaces.