The Dual Prong Base Sheet Fastener is designed to secure base sheets over gypsum, fibrous cement and lightweight concrete decks. This fastener is installed using the Carlisle Dual Prong Applicator. This stand-up applicator holds and drives the tube into the deck then, sets the wires. It consists of a galvanized (G-90) tube, shaped to easily penetrate decking and existing membranes, a 2.7-inch diameter Galvalume plate, which is securely clamped to the tube and ribbed to resist cupping, and a locking staple formed from coated high tensile steel wire for corrosion resistance.