Screws secure deck boards through their edge directly to the joist for a fastener-free deck surface | Edge Deck Screws have a rake tip that augers material out which reduces splitting and cracking | ProTech coated Edge Deck Screws are ideal for treated lumber, composite, capped composite, and PVC | 1-?-inch Edge Deck Screws are recommended for boards ¾-inch to 1-inch thick. Covers approximately 500 sq ft | Use Edge Deck Screws with Camo Pro, Pro-X1, Pro-NB, and Edge Guides