The surface of the overflow cover is treated with thickened electroplating to ensure that the paint will not peel off during long-term use and to prevent corrosion. The primary function of a sink overflow cover is to prevent water from spilling over and to protect household facilities when you leave the sink unattended or forget to turn off the faucet. This helps to avoid uncontrolled water overflow and damage to the surrounding area. These sink overflow covers are suitable for holes ranging from 0.86 inches to 0.95 inches in diameter. Please make sure it matches your sink before purchasing. Any extras can be kept as spares. Color: Matte Black. Material: Acrylonitrile Butadiene Styrene (ABS).