1,Made of brass, 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. Features: Made of brass, 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. Specification: Material: Brass Weight: Approx. 30-80g/ 1.1- 2.8oz Size (Inner Dia. x Length x Outer Dia.) andamp; Quantity: (Optional) M3 x 5 x 5.3 50pcs M3 x 6 x 5.3 50pcs M3 x 7 x 5.3 50pcs M3 x 8 x 5.3 50pcs M3 x 10 x 5.3 50pcs M3 x 12 x 5.3 50pcs M3 x 14 x 5.3 20pcs M3 x 16 x 5.3 20pcs M3 x 18 x 5.3 20pcs M3 x 20 x 5.3 20pcs Package List: 1 x Pack of Blind Hole Knurled Nuts Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store