This is a 480 piece, class 12.9 (higher tensile strength than U.S. grade 8) steel socket cap screw (allen head) assortment with a black oxide finish. It comes in a steel box that is clearly labled and has a removeable plastic tray, hinged lid and latch. It includes the following sizes: M4x10, M4x20, M5x16, M5x20, M6x12, M6x16, M6x30, M6x50, M8x16, M8x20, M8x40, M10x20, M10x25, M10x35, M12x30, M12x50. These are all very common sizes and are found in many different applications.
MSTC PART# SC480