Full Range of Sizes: This set contains 200 rubber washers in 7 different sizes (80 x 7.14 mm, 40 x 9.53 mm, 30 x 12.07 mm, 20 x 15.88 mm, 10 x 19.05 mm, 10 x 22.23 mm, and 10 x 25.4 mm) to meet a variety of wiring, conduit, and machinery applications. Superior Durability and Impact Resistance: Made from premium rubber, these washers offer excellent flexibility and durability. They are resistant to aging, temperature changes, oil stains, and chemical corrosion, and possess excellent insulation, flame retardancy, and UV stability for long-lasting durability. Versatile Applications: These versatile rubber washers are ideal for sealing and protecting wires and cables passing through wall holes, electrical appliances, automotive components, and edges or corners, minimizing wire damage and fire hazards. Organized and easy to access: Each size of washer is neatly placed in a dedicated storage box and labeled for quick identification and retrieval. This storage system ensures you can quickly and easily find the right size, improving work efficiency. Plastic box style is random; specific colors cannot be requested. Material: Rubber. Color: Black. Package Contents: 200 x 7 sizes of rubber washers set. Only the above package contents are included; other products are not included. Note: Light reflection and different monitors may cause the color of the item in the picture to be slightly different from the actual product. Measurement error is +/- 1-3 cm.