Contact Us At Cincinnati Abrasive Supply Company 4535B Port Union Road Hamilton, OH 45011 Phone: 513-941-8866 or 513-874-0540 Fax: 513-941-8963 E-mail: cincinnatiabrasive@fuse.net Customer Service Hours Our operating hours are 7:30 A. M. to 5:00 P. M. Eastern Standard Time Directions: Located in Hamilton, OH.  Take exit #42 on I-275.  Go North on Route 747 (Princeton-Glendale Road). Turn left at Port Union Road.  Turn left into driveway.  Sign shows BLACK OXIDE - Cincinnati Abrasive Supply Co.