You are purchasing a box of 10 socket head cap screws, as pictured.
Socket Head Cap Screw, Standard Head Style, Alloy Steel, Black Oxide Finish, Hex Socket, Thread Size 1/2-13, Drive Size 3/8 In, Decimal Equivalent 0.500 In, Thread Type UNC, Partially Threaded, Right Hand Thread Direction, Length Under Head 2 1/2 In, Thread Length 1 3/4 In, Head Height 0.500 In, Head Dia 0.750 In, Thread Class 3A, Rockwell Hardness C39-C45, Min Tensile Strength 180,000 PSI, Meets ASTM A574
Thanks for looking and good luck!