High Quality Materials - The screw kit is made of nylon, which is acid-, alkali-resistant, insulation, anti-signal interference, heat insulation, wear-resistant and corrosion-resistant. /li> Easy to use - The range of threaded screws includes several common metric sizes, well made, the threads are very clean, there are no sharp points and it is very convenient to use. 13 Types - Including 60 nuts, 20 hex washers, 60 screws, 60 washers, 60 M3 nuts, complete specifications and sizes, which can meet your different needs. Boxed design - All screws are arranged in a transparent PP small parts box. The sorting is reasonable, the location is excellent and the overview is unobstructed. You can store and transport these small screws in a way practical. Applicability - Very suitable for installation between the circuit board and the machine board. Specification: Material: Nylon Color: black Size: please refer to size chart for detailed size Weight: 110 grams Include: 60 x M3 nut 20 x M3 Hex