High Quality Materials - The screw kit is made of nylon, resistant to acid, alkali, insulation, anti-signal interference, heat insulation, wear and corrosion. / li> Easy to Use - Threaded screw range includes several common metric sizes, well made, the thread is very clean, there are no tips and it is very convenient to use. 13 Types - Including 60 nuts, 20 hex washers, 60 screws, 60 washers, 60 M3 nuts, full specifications and sizes, which can meet your different needs. Boxed Design - All screws are arranged in a transparent PP small parts box. Sorting is reasonable, the location is excellent and the overview is clear. You can store and transport these small screws in such a way practical. Applicability - Very suitable for installation between printed circuit board and machine board. Specification: Material: nylon Color: black Size: please refer to the size chart for detailed size Weight: 110 grams Include: 60 x M3 nut 20 x M3 hexagonal washer 20 x M3x6mm screw 20 x M3x12mm screw 20