Will these fit 3/4 inch wire shelving poles?

Hi, Steph. These wheels fit Whitmor's Supreme shelves with 1-inch tubes only. If you are in need of heavy duty wheels for a 3/4 inch tube for your Whitmor item, I'm sure we can come up with a solution for you. Have your Whitmor item style number handy when you give us call. Feel free to call us at, (888) 944-8667, Monday-Friday, 8am-4:30pm. Hope to hear from you soon.

What is the thread size on these wheels?

the thread size checks out surprisingly in standard and metric, std 3/8-16 or M10-1.50mm, I would go to a hardware store and check on a nut of those sizes to see which one works,I hope this was of some help.

How much height do these add to a shelf like the 72 inch 6070-5264 supreme 5-tier shelving unit?

Hi, Mike. The wheels add 5.32 inches in height to our shelving units.

This is a question response reply, the posts on my rack are 1", but the insert area measures 3/8". are the insert measurements of your casters 3/8"?

I'm sure you realize these casters are designed specifically for Supreme Shelving storage racks-- which mine are. If your storage posts are 1 inch in diameter, they probably will fit. I can't take one off of my shelving to measure because I already have many heavy items on the shelves, and I am disabled, but my experience tells me that they are larger than a quarter inch in diameter, but not large enough to be a half-inch. My best, educated guess is they will; especially if you have Supreme Shelving-- since you don't mention it in your question, I am assuming the shelving you have is not the same brand. As I mentioned before, chances are they will fit. I hope this has in some way helped you.

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