For roofing applications, the SPIKE® is a one-piece, vibration resistant anchor available in 3/16" and 1/4" diameters for use in fastening insulation, single-ply membrane, wood, and metal to structural concrete roof decks. This version of the SPIKE® has a Perma-Seal™ coating a proprietary fluoropolymer which meets the corrosion resistance requirements of FMRC Standard 4470. It is designed for use in conjunction with Powers insulation or membrane stress plates.