Features: 290Pcs 7Sizes Internal Tooth Star Lock Washers: This quality lock washer set includes 290pieces in 7different sizes (20pcs ,40pcs M10x20mm,52pcs M8x18mm,52pcs M6x14mm,42pcs M5x12mm,42pcs M4x12mm,42pcs M3x9mm). Quick Speed Locking Washers: These tooth lock washers are designed for quick and easy installation, providing a secure and reliable locking mechanism. Push On Retaining Clips Fasteners Kit: This kit includes a variety of sizes to suit different applications, making it suitable for use in machinerys, furniture, electrical appliances, and more. Quality: Made from durable carbon steel, these lock washers are built to last. Black Color: The black color of these lock washers adds a sleek and professional look to your projects, making them a great choice for both professional and DIY use. Specifications: Material:Carbon Steel 290pieces in 7different sizes:20pcs ,40pcs M10x20mm,52pcs M8x18mm,52pcs M6x14mm,42pcs M5x12mm,42pcs M4x12mm,42pcs M3x9mm Package Includes: 20pcs 40pcs M10×20mm 52pcs M8×18mm 52pcs M6×14mm 42pcs M5×12mm 42pcs M4×12mm 42pcs M3× 9mm note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.