Socket Head Cap Screw, System of Measurement Inch, Button, Basic Material Steel, Material Grade Alloy Steel, 5/16 In.-18, Length 1 In., Fastener Finish Black Oxide, Fastener Thread Type UNC (Coarse), Drive Type Hex Socket, Drive Size 3/16 In., Thread Style Fully Threaded, Thread Direction Right Hand, Thread Length 1 In., Head Height 0.166 In., Thread Dia. 5/16 In., Package Quantity 100