Heavy-duty concrete screw anchors designed for reliable fastening in concrete, masonry, and similar materials. The 1/2" diameter x 2" length wedge-bolt design expands as you tighten, creating a secure mechanical lock without pre-drilling. Ideal for anchoring equipment, fixtures, and structural components in construction and renovation projects. Box of 200 units provides ample supply for medium to large jobs. Powers Fasteners quality ensures consistent performance and durability in demanding applications.