Stayput Shock Cord Hook Black features smooth rounded surfaces with no sharp edges that could cut into rope or elastic cord. The narrower opening at the end of the hook allows the rope or cord to snap into position reducing the chance of it slipping out if it becomes slack, particularly when using rope. Best suited to use with countersunk screws (sold separately). Stayput Lashing Hooks are made from high quality UV stable Nylon Composite components. Stayput Fasteners are also resistant to corrosion and will provide many years of trouble free operation, particularly in a marine environment. Use with up to 1/4" shock cord. Base Dimensions: 1-5/16" x 1" Height: 11/16"