Coolnut 20PCS 3/8\"(10mm) x 3\" Zinc-Plated Concrete Screw Bolts (Hex) — Masonry Anchors for Brick & Block, Includes Washers, Hex Nuts & Hex Driver

Pack of 20 Coolnut concrete screw bolts, 3/8" (10mm) x 3", zinc-plated with hex heads—built as masonry anchors for brick or block. Engineered for fast installation to reduce setup time and effort. Made from dual-hardened carbon steel and tested for static, wind, and seismic loads to deliver reliable performance. Low expansion forces allow secure fixing close to edges without compromising holding strength. The full installation kit includes 20 washers, matching hex nuts, and a hex driver so no additional parts are required. Backed by 24/7 customer support and free refunds for any quality issues.