This black rubber washers penny form a metric thick neoprene washer is a high-quality product that is perfect for any business or industrial application. The mandrel material is made of rubber, which ensures durability and longevity. The washer is designed with a universal hardware brand, making it compatible with various fasteners and hardware. The penny form of this washer is ideal for use in other fasteners and hardware applications. It is made of high-quality materials that are designed to last for an extended period. This product is perfect for those who are looking for a reliable and durable washboard that is suitable for any business or industrial application.