Map for SpecGrade Map for SpecGrade Search | Advanced Search | New Members | Coupons and Discounts | All Categories Public Utilities & Environment >> Electric Lighting Equipment Manufacturing SpecGrade 639 Eastgate ParkwayGahanna, OH 43230 | directions (614) 868-5337 Visit Site Need to update your categories or expand your listing? Or want to learn how your business can become a part of the Chamber? Contact us at membership@columbus.org for assistance.