Specification:Material: BrassQuantity: 150pcsColor: YellowPackage Weight: Approx. 146g/5.1ozPackage list:30 x M5*5 30 x M5*630 x M5*830 x M5*1030 x M5*12 Features: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.6. All nuts is sorted and packed in a plastic case, convenient to carry and use.