iExcell 100 Pcs M4 x 8mm / 10mm / 12mm / 14mm / 16mm 12.9 Grade Alloy Steel Hex Socket Head Cap Screws Kit, Black Oxide Finish

?Meets/exceeds: DIN 912, ISO 4762 ?Screw head style: socket cap; screw drive style: hex socket , known as internal hex drives ?12.9 grade alloy steel, hardness: HRC 39-44, tensile strength: 1220N/mm² ?Rust proof: black oxide finish, covered with anti-rust oil ?These screws come in a separated girds storage case Package Contains: M4 x 08mm ----------20 Pcs M4 x 10mm ----------20 Pcs M4 x 12mm ----------20 Pcs M4 x 14mm ----------20 Pcs M4 x 16mm ----------20 Pcs Total: 100 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 Socket Cap Head Socket Cap Head screws, also known as Allen head screws, have a recessed drive, and are commonly used when there is not enough clearance for a conventional wrench or socket. They are fastened with an Allen wrench, which is also called a hex wrench or hex key