Thread Size: 5/16-18; Thread Pitch: 18 TPI; Thread Length: 1 inch (measured from under the head); Thread Type: Full Thread , Coarse Thread UNC Material: 304 stainless steel (A2) and no exterior finish, greater strength and corrosion resistance performance than regular stainless steel or zinc plated fasteners. Package: 20 Pieces; Allen Hex Drive Size: 1/4 inch Head Diameter: 15/32 inch; Head Height: 5/16 inch Ideal used in furnitures, 3D printer projects, machinery industry and other indoor or outdoor projects. 5/16-18 x 1 (20 pcs) Socket Head Cap Screws, Allen Hex Drive, 18/8 Stainless Steel 304, Full Thread, Bright Finish, Coarse Thread