Answer
Nov 19, 2015 - 12:00 AM
Thank you for your inquiry. The 12" Metal Shelf Brackets will fit into a 1/2" slot that is 1" on center for the slotted standards. I am not familiar with the brand of National uprights, so I would not be able to determine if the shelf brackets would fit into those slotted standards. If you are interested in purchasing a large quantity I would recommend e-mailing your request to contactus@storesupply.com or calling our Customer Service Department at 800-823-8887 for more details. Thank you again, have a great day!