1Made of high quality brass, it is of high hardness and good durability. 2No deformation under great pressure. 3Resistant to wear, oxidation and corrosion, long service life. 4Knurled surface makes nuts embed installed object tightly and stably. 5High precision threads is compatible with corresponding screws. 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. Specification: Material: Brass Quantity: 150pcs Color: Yellow Package Weight: Approx. 146g/5.1oz Package list: 30 x M5*5 30 x M5*6 30 x M5*8 30 x M5*10 30 x M5*12 Note:Due to the difference between monitors and light effect, the pictures may not reflect the actual color of the item.