Specification: Product Name: Knurled Brass Threaded Nut Assortment Kit. Material: Brass Color: Gold Quantity: 330 Pieces Height: 4mm, 6mm, 8mm, 10mm Inner Diameter: 2mm, 3mm, 4mm, 5mm Outer Diameter: 3.5mm, 5mm, 6mm, 7mm Advantage: 1. Uniform spacing, clear lines, uniform force, high strength, stronger. 2. Smooth surface without burr, standard circular, firm and uniform , easy to install. 3. Not easy to rust, strong corrosion resistance. 4. No need to counterbore or countersink the boss hole since the insert has a guide pilot . 5. Packed in a handy resealable plastic storage case. Package includes: 【M2】 M2 x 4 x 3.5mm————————–30 Pieces M2 x 6 x 3.5mm——— ——————30 Pieces M2 x 8 x 3.5mm——————– ——-30 Pieces M2 x 10 x 3.5mm————————-20 Pieces 【M3】 M3 x 4 x 5mm - —————————30 Pieces M3 x 6 x 5mm———— —————–30 Pieces M3 x 8 x 5mm———————- ——-20 Pieces M3 x 10 x