These rollers are excellent especially for large pots. When using smaller pots we found that the pots do not fit neatly onto the rollers as the larger pots fit.
They are still a great product to purchase.
My deck has xxl size pots Omnia make life so easy, my back forever grateful.
I have a number in both sizes, worth the investment. Easy to clean underneath , a slight push , easily moved. Highly recommend, Omnia perform as advertised.