Mantis Hidden Deck Clip The newest generation of hidden deck fasteners, featuring Mantis technology provides a hidden fastener solution for grooved decking made from PVC polyvinyl chloride , composites, or wood products. Features include no visible fasteners, unique starter and finish clips ensure an unblemished deck surface; reduced potential for mildew and rot, clips elevate the deck boards off joints for proper airflow and drying; uniform installation and appearance, clips automatically space deck boards 3/16 to help ensure even spacing; high strength steel fasteners, unique coating process for corrosion resistance. Recommended for use with ACQ Alkaline Copper Quaternary and other treated lumber joists. The 90 pieces per box includes 5 starter and 5 finish clips and covers 50 sq ft. The 450 piece bucket does not include starter and finish clips and covers 250 sq ft. Starter and finish clips are sold separately. #2 square drive screws included with clips. 30 year limited warranty against loose deck boards, leading performance in hold down and lateral movement. Size Automatic Spacing 3/16 , Material High Strength Steel, Gauge 16 ga, Finish Corrosion Resistant Coating, Pkg Qty 90, Package Type Box WARNING Cancer and Reproductive Harm www.P65Warnings.ca.gov