The Collated Cortex Hidden Fastening System for Veranda Decking in 2-1/2 inch Stone Gray is a high-quality fastening solution for exterior deck projects. This system includes fastener plating of electro galvanized zinc, a driver bit, and 75 carbon steel composite deck screws with a coarse thread style and Torx drive style. The screws have a low profile head style and are designed for a rail height of 1 1/2 inches. Manufactured by FastenMaster in the United States, this product meets ASTM standards and offers a convenient and efficient way to secure your veranda decking.