1. Product material: 304 stainless steel, zinc-plated, in order to prevent rust and oxidation
2. Head style: Cylinder cup head.
3. Groove shape: Hex Socket cap.
4. Quantity and species: 12 species, M2 M3 M4 screw, nut and flat washers will be sold together, a large amount of variety for your option.
5. Widely use: This package include a variety of popular size of screw nuts and washer, to suit your need, commonly used in machinery, furniture, car and motorcyle, repair and DIY inventions.