Descriptions:1. 45# carbon steel material, with quenching treatment for high hardness and durability. It is rust protection and corrosion resistance, can be used in various conditions.2. The surface is polished and smooth, which is easy to install without any complicated tools.3. Dowel pins are most generally used to connect two components to make them more stable. It can also be used to fix components' position and maintain alignment between different parts.4. Good replacement for hand-making, shelf, bookshelf, table, chair and other home furniture.5. It can be easily installed on wood products, industrial machines and metal equipment such as punch presses, pin gauge, hinge and other machines.Specifications: Color: Silver ToneMaterial: 45#Carbon SteelThread Size: Female M3Surface Finish: QuenchingInner Thread Length: 7mmTotal Size: 4x 12mm / 0.16 x 0.47-inch ( D x L)Package Content: 20pcs x Dowel Pin