These bearings can be used with the Threaded Rod Plate. They are awesome and super affordable!  Grab a bunch today. Used with 8mm ACME rod 688Z Ball Bearing ABEC 1 RPM rating 5000-6000 8mm Bore 16mm OD 5mm Width Lead Screw example build models Example 1 - Example 2

These are the small bearings that are included with the Mini V Wheel Kits. They can fit a variety or projects, for instance, filament extruder as they have a standard 5mm ID bore. Part Details Chrome Steel Dimensions 10 OD x 5 ID (M5 Screw Size) x 4.2mm 'thick'  Version 3 ABEC 3

These are the bearings that are included with the OpenBuilds V Wheel Kits.  They are awesome and super affordable!  Grab a bunch today. 625 2RS Ball Bearing ABEC 1 5mm Bore 16mm OD 5mm Width