Features: Made of high quality brass, it is of high hardness and good durability. No deformation under great pressure. Resistant to wear, oxidation and corrosion, long service life. Knurled surface makes nuts embed installed object tightly and stably. High precision threads is compatible with corresponding screws. All nuts is sorted and packed in a plastic case, convenient to carry and use. Specification: Material: Brass Quantity: 170pcs Color: Gold Weight: Approx. 106g/3.7oz Package list: 30 x M4*4 30 x M4*5 30 x M4*6 30 x M4*8 30 x M4*10 20 x M4*12 1 x Plastic Box Note: 1. Please allow small size error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 1、Made of high quality brass, it is of high hardness and good durability 2、No deformation under great pressure 3、Resistant to wear, oxidation and corrosion, long service life 4、Knurled surface makes nuts embed installed object tightly and stably 5、High precision threads is compatible with corresponding screws