iExcell 20 Pcs M8 x 40 mm Stainless Steel 304 Hex Socket Head Cap Screws Bolts Nuts Kit

? Meets/exceeds: DIN 912, ISO 4762 ? Material of Screws and Nuts: stainless steel 304, high strength and anti-corrosion in various environments ? These screws and nuts come in an easy-use separated girds storage box Sizes--------------Thread Length------Total Length M8 x 40 mm-----------40 mm-------------48 mm Package Contains: M8 x 40 mm--------10 Pcs Nuts---------------10 Pcs Total---20 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 , also known as Allen head , 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