I used these non-marking casters to replace casters on Ikea ALEX. The stems of the original flexed during movement. These 2 inch rolls are nearly identical in overall height and look much bulkier. The diagonal mounting slots could accommodate the original mounting holes, which was a plus. They also work well if you want to use ALEX (or maybe a lot of IKEA furniture on wheels) on a wooden floor. One star deducted because the bearings on some of them were quite sticky. They all spin well.