Coarse thread. Hot dipped galvanized. Suitable for use in treated lumber. Low-carbon steel. No. 810503: Thread Type: Coarse, Thread Diameter: 1/4", Threads Per Inch: 20 tpi, Material: Low Carbon Steel, Finish: Galvanized, Pkg Qty: 100 No. 810506: Thread Type: Coarse, Thread Diameter: 5/16", Threads Per Inch: 18 tpi, Material: Low Carbon Steel, Finish: Galvanized, Pkg Qty: 100 No. 810509: Thread Type: Coarse, Thread Diameter: 3/8", Threads Per Inch: 16 tpi, Material: Low Carbon Steel, Finish: Galvanized, Pkg Qty: 100 No. 810512: Thread Type: Coarse, Thread Diameter: 1/2", Threads Per Inch: 13 tpi, Material: Low Carbon Steel, Finish: Galvanized, Pkg Qty: 50 No. 810515: Thread Type: Coarse, Thread Diameter: 5/8", Threads Per Inch: 11 tpi, Material: Low Carbon Steel, Finish: Galvanized, Pkg Qty: 25 No. 810518: Thread Type: Coarse, Thread Diameter: 3/4", Threads Per Inch: 10 tpi, Material: Low Carbon Steel, Finish: Hot Dipped Galvanized, Pkg Qty: 20