Socket Head Cap Screw, System of Measurement Inch, Cylindrical, Basic Material Steel, Material Grade Alloy Steel, 1/2 In.-20, Length 2-1/4 In., Fastener Finish Black Oxide, Fastener Thread Type UNF (Fine), Drive Type Hex Socket, Drive Size 3/8 In., Thread Style Partially Threaded, Thread Direction Right Hand, Thread Length 1-1/2 In., Head Height 1/2 In., Thread Dia. 1/2 In., Package Quantity 10