The Faster Fastener: Designed for quick and simple installation, these Frueh hidden fastening clips are the perfect solution for installing tongue and groove boards on walls and ceilings without face nailing. Tongue and Groove boards come in a variety of groove depths and heights. Please be sure to measure your profiles before ordering - refer to the graphic to see which board dimensions to measure. Material: Tongue and Groove Fasteners come in three materials - galvanized steel, chromate-coated galvanized steel for extra corrosion protection, and stainless steel for the best protection against corrosion. Package contents: 100 clips per pack, 100 screws 3.0 x 17 mm (covers approximately 50ft2) NOT compatible with (ungrooved) shiplap siding or any flooring applications TG-Clip (8.5 x 4.0) - Stainless