The NEW FastenMaster Universal Hidden Deck Fastening System 200 sq ft. FMTHDCLIP-500 is a high-quality fastening solution for decks and other outdoor structures. Made of durable stainless steel and carbon steel, this system features a round shape and a galvanized finish for added protection against the elements. With an open end design and star drive style, this screw cover system is easy to install and provides a secure hold for your deck boards. Designed by FastenMaster, a trusted brand in the industry, this system is perfect for creating a smooth and professional-looking deck.