Features: Crafted from 304 stainless Steels, highly hardness, not deformation, antioxidation, wear resistance, corrosion resistance, which can ensure long terms use. 200pieces in total, packed in plastic box with labels. It is easy to distinguish the size of the product. Widely used in most kind of precisions machinerys industry, instrument, electronic product, print projects, household appliances, communication product, lock, lamp, light, toy, etc. Size: M3x30mm/35mm/40mm/45mm/50mm Metric screws, total 5 size, different size can meet your different needs. Tips: Product contain small part, keep away from kids and prevent inadvertent swallow. Specifications: Material: 304 stainless steels Length: 30mm (1.18inch)/35mm (1.38inch)/40mm (1.57inch)/45mm (1.77inch)/50mm (1.97inch) Package Includes: 20pcs 3mmx30 20pcs 3mmx35 20pcs 3mmx40 20pcs 3mmx45 20pcs 3mmx50 100pcs 3mm Nut note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.