Gisafai Roller Ball Transfer Bearing Carbon Steel Round Ball Transfer Unit Universal Casters for Conveyor Roller Stand Transmission System Furniture(60 Pcs,1")

Used as castors for moderate weight display units. They work fine

Used them to make a roll out tray in the pickup bed, perfect application

The bearings are making a lot of noise

These steel round balls work great for moving stuff on the concrete garage floor but no so much on wooden floors. The actual contact surface is only a few millimeters so if you are moving anything heavy you’d need several of them under the same board. I noticed that they dented a wooden area immediately; luckily it wasn’t in the house. They are easy to install and reuse so I don’t mind drilling a whole bunch just to distribute the weight equally then uninstall them for the next project.

These roll perfect under my crates that hold heavy ammunition boxes. I can roll them around on my concrete floor from under the shelves with ease.

Works great. They are just what I needed. Even my wife used some of them.

With a .2 inch/6 mm hole for mounting to various items, you can find a ton of things to make mobile with these roller balls. It also has a 400 lb load bearing capacity, which is impressive. The use cases here are almost to enumerable to be mentioned, but for me, I mounted these under a treadmill that originally only came with two. They don't have brakes, so you'll want to keep that in mind, but on a pure cost for benefit ratio, this is a great value. The rollers roll easily and you can tell these were made to last. Product recommended.

Hardly woke with your finger trying to roll them, junk