iExcell 50 Pcs M6 x 8mm / 10mm / 12mm / 16mm / 20mm 10.9 Grade Alloy Steel Hex Socket Button Head Cap Screws Assortment, Black Oxide Finish

?  Screw head style: button ; Screw drive style: hex socket, known as internal hex drives ?  10.9 grade alloy steel, Hardness: HRC 32-39 ?  Rust proof: black oxide finish and anti-rust oil covering ?  Easy to store: these screws come in an easy-use storage case Item-----------Thread Length---------Total Length M6 x 8 ----------8mm/0.31"-----------11.2mm/0.44 M6 x 10 --------10mm/0.39"----------13.2mm/0.52" M6 x 12 --------12mm/0.47"----------15.2mm/0.60" M6 x 16 --------16mm/0.63"----------19.2mm/0.76" M6 x 20 --------20mm/0.79"----------23.2mm/0.92" Package Contains: M6 x 8--------10 Pcs M6 x 10-------10 Pcs M6 x 12-------10 Pcs M6 x 16-------10 Pcs M6 x 20-------10 Pcs Total: 50 Pcs About Hex Socket Drives ?Hex socket drives, also known as internal hex drives have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen wrench. About Button Head ?Button head is similar to standard pan head but have a curved top