2 Pcs U604ZZ U-Groove Guide Pulley Bearings - 4x13x4mm, Sealed, For 3D Printer & Rail Systems

Need some small, precision bearings for a project?

This pack gives you two U604ZZ U-groove guide pulleys.

They measure 4mm bore, 13mm outer diameter, and 4mm width.

The \U\ groove makes them perfect for riding on rails or belts, which is why they're commonly used in 3D printers and other linear motion systems.

They're sealed (ZZ) to keep dirt out and run smoothly.

These are brand-new, unbranded bearings that get the job done without breaking the bank.

Whether you're building a printer, fixing a CNC machine, or working on any DIY project that needs a smooth-rolling pulley, these little guys are handy to have around.