624ZZ Ball Bearing (4x13x5)
These bearings are made of quality chrome steel, which ensures they are durable and long lasting. We have used them extensively in our printer builds and found them to be reliable in every way.
These bearings are also double shielded (shielded on each side), in order to keep dust and other particulates out.
They fit an 4mm shaft, and are often used in 3D printer / RepRap builds - most commonly in belt driven systems. They can also be used in filament holders/rollers, along with many other 3D printing and CNC applications.
If you're putting together a printer, you'll probably be after more than one - check the related items for a ten pack offering even better value!