The 3/8 x 1 3/4 DeWALT Engineered by Powers SCREW-BOLT ™ High Performance Screw Anchor Zinc-Plated (50) is designed to provide powerful performance in the toughest conditions. Made from zinc-plated steel for corrosion resistance, each anchor offers superior holding power for reliable connections in concrete, block, and brick. It can be installed easily without special tools and can be used with drywall.