Sold as 4 units at $7.05 per unit. (1 unit = Cd/12). Permanent screw threads. Diamond shape wire. Drive for installation, notched for "Tang" removal. Carded/12. 1/4"-20 x .375 USS thick. Manufacturer Number: R1185-4. SKU #: 85868. Country of Origin: (TBA). Distributed by helical division.