5/10/50x: This indicates the quantity of screws you are referring to. It appears to be a variable quantity, with "x" representing the multiplication symbol.
M1, M1.2, M1.4, M1.6, M2, M2.5, M3, M3.5, M4, M5, M6, M8: These are metric screw sizes, denoted by the "M" followed by a number. Each number represents a different screw size, ranging from M1 (smallest) to M8 (largest). The numbers in between indicate intermediate sizes.
A2-70: This refers to the material grade of the screws. "A2" is a designation for austenitic stainless steel, which is commonly known as 304 stainless steel. The number "70" represents the tensile strength of the material, indicating that the screws have a tensile strength of 700 N/mm².