This eye bolt for wingnut assembly is a replacement parts which is commonly found on vacuum tanks, manways, vacuum trailers, frac tanks, storage tanks, and pressure vessels.
Each eye bolt also need these parts a wing nut, clevis pin, cotter pin, and washer to complete a wingnut assembly.
The wingnut assembly is non code. This means that they cannot be used on tanks that store or haul corrosives, explosives or combustible materials.