General description 280Pcs Steel Lock Washers are designed for quick and reliable fastening in various applications. Made from durable 65 manganese steel, these lock washers come in seven different sizes to accommodate a range of needs. Technical specifications Material: 65 manganese steel Quantity: 280 pcs Sizes: M3*9mm, M4*12mm, M5*12mm, M6*14mm, M8*18mm, M10*20mm, M12*25mm Plastic box dimensions: 9.5*17*2.2cm Color: Black Usage Ideal for securing bolts and screws in various DIY and home improvement projects. Provides enhanced grip and prevents loosening due to vibration.