Crown Bolt 44640 1/2 Inch-13 x 4 Inch Stainless Steel Carriage Bolts, 25-Count Stainless steel 1/2 inch-13 x 4 inch carriage bolts For general applications 1/2 inch body diameter and thread pitch 4-inch fastener length Stainless Steel Finish Offers Rust-Oleum Certified Rust Protection