This cast brass or bronze alloy grease cap is designed for the front wheel hubs of early 20th-century Chevrolet automobiles. The cap features a hexagonal top section intended for application and removal with a wrench. The flat top surface is embossed with an early iteration of the Chevrolet bowtie logo, containing the brand name spelled out in capital letters. The interior of the cap is threaded for secure attachment to the axle hub assembly. Diameter: Approximately 2.25 inches.