These lock nuts are made of alloy steel materials, strong and durable, with excellent texture, and can serve you for a long time without being easily damaged or deformed. It has a simple design and practical functions, can play an excellent fastening effect and excellent stability, and will not easily loosen. This is a very practical fastening screw, which will serve you well. Features -Color:Black. -Material:Alloy Steel. -Size: About12.70X6.80X2.20cm/4.99X2.67X0.86inch. -It is made of alloy steel material, safe to use, sturdy and durable. -With excellent stability and fastening effect, it can bring convenience to your work. -It is made with excellent craftsmanship, has excellent texture, and has excellent anti-rust performance. -The high-strength hexagonal screw set has practical functions and can meet your needs. -Simple and practical, easy to install, you can use it with confidence.