Looking for a reliable sealing solution. Our 378-piece NBR metal - bonded sealing washer assortment kit is the answer. It comes with 12 different inner diameter sizes (6mm - 30mm), providing a comprehensive range to meet all your sealing requirements. The high - quality NBR carbon steel seals offer excellent sealing performance, high - pressure resistance, heat resistance, and abrasion resistance, ensuring a long service life. The self-centered design makes installation easy and accurate, reducing the risk of leakage. This kit is widely used in automobiles, electrical appliances, bearings, pumps, and high - pressure fuel systems. It is stored in a sturdy plastic box with each size clearly labeled, allowing for easy storage and quick access. Whether you're a professional mechanic or a DIY enthusiast, this kit will bring convenience to your work and help you solve sealing problems efficiently.