A trim head decking screw is a type of decking screw that has a low-profile head, often designed to be flush or nearly flush with the surface of the decking board. This allows for a cleaner and more finished appearance, especially when the decking is stained or painted. Trim head decking screws are typically made of ruspert coated steel for weather resistance and are available in various lengths and diameters to suit different decking board thicknesses and spacing.