I needed small diameter wheels for my desktop floor stand. The stand allows me to easily access the back of my heavy computer and move the unit back and forth for cleaning. These wheels are perfect for this role. The locking mechanism doesn't come loose randomly (which was annoying on other wheels I've tried). With rubber wheels, the board leaves no marks on parquet floors. Obviously, with such small wheels, this solution is better suited for hard surfaces and low-pile or matt carpets! The overall quality is excellent. I bought 3 sets, there were no defects. The reels use ball bearings so they spin easily. I've replaced the included screws with button head screws, but that's just personal taste.