The TOOLCRAFT to-5390679 is a spring pin made from high-quality spring steel, designed for reliable fastening applications in mechanical assemblies and industrial plants. This one-piece cotter pin features a robust construction that ensures secure locking in drilled holes and prevents components from loosening under vibration or dynamic loads. With a diameter of 12 mm, it provides precise fitting and easy installation with standard tools. The spring steel material offers excellent elasticity and corrosion resistance, maintaining performance under various environmental conditions. Ideal for use in machinery, vehicle systems, and construction projects, this pin supports long-term stability and reduces maintenance needs. Its simple design allows for quick assembly and disassembly, facilitating efficient repairs and adjustments. The product meets industrial standards for mechanical fasteners and offers consistent holding power and durability. Packaged as a single piece, it is suitable for professional workshops, manufacturing facilities, and DIY enthusiasts seeking reliable hardware solutions.