Socket Flat Countersunk Head Cap Screw, 5/16-18 x 1", Alloy Steel, Black Oxide, Hex Socket (Quantity: 100) Coarse Thread, 5/16 inch Hexagonal Allen Bolt, Length: 1 inch, Full Thread

Thread: Coarse / Full Thread / Alloy Steel / Black Oxide, Recommended Hex Socket Allen Key Wrench: 3/16 Inch, Black Oxide is not a protective finish and will rust if exposed to moisture. Stainless Steel material is recommended for environments with moisture