Made of carbon steel with Stalgard coating PanelMate fasteners offer one-time installation – the anchors stay in place, ready for even faster and easier panel mounting. Fasteners accept standard 1/4-20 hardware Provide outstanding corrosion resistance (withstands 800 – 1000 hours in salt spray testing per ASTM B117 standards) Tested to tough Miami-Dade hurricane standards Panelmate Pro Anchors for hurricane shutters. Made of carbon steel with Stalgard coating. Just drill and drive, no need to countersink! Installs with standard 7/32" ANSI masonry drill bits 1/4-20 threaded stud has 1-1/8" standardized length of (one part has 2-1/4" length and 7/8" threaded stud length) Oversized #14 diameter with V-notched threads (.265" O.D.) For concrete, block or wood applications