The 5975000321 is a Toroid Core from FAIR-RITE, a leading manufacturer of ferrite components. Supreme Components International is an authorised distributor of FAIR-RITE, ensuring you receive genuine, high-quality products. This particular core is made from #75 material, known for its specific permeability and frequency characteristics. The uncoated surface allows for direct winding and optimal heat dissipation. Toroid cores are widely used in power inductors, transformers, and chokes due to their efficient magnetic field confinement, which reduces electromagnetic interference (EMI) and improves overall circuit performance. Consider this core for your next project requiring a reliable and efficient magnetic component.