Comprehensive washer set: 285 pieces with 7 sizes of internal tooth lock washers, providing the right fit for varied applications. Sturdy carbon steel construction: Star lock washers made from carbon steel; capable of withstanding significant loads and impacts for longlasting performance. Multipurpose usage: Suitable for mechanical equipment, automotive manufacturing, shipbuilding, aerospace, and rail transportation; functions include fixing and supporting. Effective spring pressure: Uses spring pressure to secure reinforced objects; prevents loosening of threaded fittings; strengthens the performance of parallel bars or ring gaps. Key benefits Reduces the risk of fastener loosening in vibrationprone assemblies. Offers a ready set of right sizes (7 sizes) for versatile compatibility. Delivers durable, load performance from carbon steel star lock washers. What makes it stand out Large 285piece set provides a broad range of sizing for multiple projects. Internal tooth design with springloaded action enhances secure fixing. Robust carbon steel construction ensures longterm reliability in demanding environments. Use scenarios Automotive manufacturing or service: securing vibrationprone engine components, brackets, and fasteners to maintain tight joints during operation. Mechanical equipment and industrial machinery: fixing guards, supports, and brackets where consistent locking and load resistance are needed. Shipbuilding, aerospace, and rail applications: securing structural joints and deck hardware that experience dynamic loads and movement.