Washers are one of the simplest, yet most engineered, precise, and useful seal designs ever developed. They are available in various metric and inch standard sizes. Sizes are specified by the inside diameter and the cross section diameter (thickness).This DANCO Washer Assortment will repair your leaky faucet in no time. Faucets usually have one or more washer to prevent water from leaking out around the spout. Replacing worn-out washers is an inexpensive alternative to replacing the entire faucet fixture. New washers will return the faucet to like new condition by providing a positive seal. Correcting leaky faucets saves water and energy. Color: Black. Material: Rubber.