iExcell 720 Pcs M3 12 9 Grade Alloy Steel Hex Socket Head Cap Screws Nuts Hex Key Wrench Assortment Kit

?These screws meet/exceed: DIN 912 ?Material of nuts: 8.8 grade alloy steel ?Material of screws: 12.9 alloy steel, hardness: HRC 39-44, tensile strength 1220 N/mm² ?Material of Hex Key Wrench: chrome-vanadium steel, nickel plated ?Surface Finish: black oxide finish with anti-rust oil ?Easy to store: these screws and nuts come in an easy-use storage case Item---Thread Length---Total Length M3 x 5--------5mm--------8mm M3 x 6--------6mm--------9mm M3 x 8--------8mm-------11mm M3 x 10------10mm-------13mm M3 x 12------12mm-------15mm M3 x 16------16mm-------19mm M3 x 20------20mm-------23mm M3 x 25------25mm-------28mm M3 x 30------30mm-------33mm Package Contains: M3 x 5------------40 Pcs M3 x 6------------40 Pcs M3 x 8------------40 Pcs M3 x 10-----------40 Pcs M3 x 12-----------40 Pcs M3 x 16-----------40 Pcs M3 x 20-----------40 Pcs M3 x 25-----------40 Pcs M3 x 30-----------40 Pcs M3 Nuts---------360 Pcs Hex Key Wrench--1 Pcs Total: 720 Pcs About Hex Socket Drives: ?Hex socket hex 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.