This is a handy set of BK and BF series fixed bearing units, perfect for storage, replacement, or assembly in machinery, CNC spindles, or precision tooling. It includes BK10, BK12, BF10, and BF12 ball spindle bearings—all brand new and unused in their original packaging. These unbranded but solidly made bearing units are essential for anyone working with small mechanical systems, 3D printers, or industrial equipment. They're ready to install and help reduce friction while maintaining alignment. Whether you're a hobbyist, machinist, or maintenance tech, having these on hand means less downtime and smoother operation. No fancy branding, just functional parts that get the job done. Keep your projects running smoothly!