Key benefits - Versatile size range: available in sizes M3, M4, M5, M6, M8, M10, M12, M14, M16, M18 to meet a wide variety of fastening needs. - Durable materials: made of brass or copper for good quality and long term durability. - Flexible quantities: packs include 2 to 30 pieces, allowing you to choose the right amount for small or larger projects. - Reliable locking: spring lock washer design helps prevent loosening of nuts and bolts, especially in vibration or dynamic load applications. - Concrete example of applicability: includes 2 pieces of M18 copper washer for specific fastening requirements. Specifications and features - Material: brass or copper - Size range: M3, M4, M5, M6, M8, M10, M12, M14, M16, M18 - Quantity: 2 to 30 pieces per pack - Function: spring lock washer design to resist loosening of nuts and bolts - Compatibility: suitable for metric bolts and nuts in the corresponding M sizes Usage scenarios - Automotive maintenance and repair: use with metric fasteners to prevent loosening in engines and other vibration-prone areas. - Machinery assembly and industrial equipment: secure fasteners in equipment subject to vibration to maintain assembly integrity. - Plumbing or electrical installations: copper or brass washers used in joints where conductivity, corrosion resistance, or specific material properties are preferred. Notes - The product remains compatible with the listed metric sizes (M3 to M18) and is designed to provide a reliable locking solution for corresponding fasteners. - The copper washer example demonstrates the practical use with copper material for appropriate fastening requirements.