Used to fasten hurricane/storm panels to concrete, block or wood structurals when a non-protruding stud is required. Fastener is drilled and tapped to accept 1/4-20 hardware. Can be easily adjusted to fine-tune panel attachment. Stalgard finish provides outstanding corrosion resistence (withstands 800 ? 1000 hours in salt spray testing per ASTM B117 standards). Meets TDI and Miami-Dade County hurricane standards. TDI approval documentation pending.