The oven bulb lens cover is made of glass and is approximately 2.75 inches in diameter. The lens cover protects the light bulb from being damaged. If the lens is cracked, damaged, or missing it will need to be replaced. It is suggested to make sure that the lens cover is cool to the touch before you start this repair. To remove the bulb lens cover simply slide the retaining clip off and then remove the lens. Replace it with a new cover and slide the retaining clip back on to hold it into place. This is an OEM part sourced from the manufacturer.