The FAIR-RITE 5977000621 is a Toroid Core designed for optimal performance in a wide range of electronic applications. Supreme Components International is an authorised distributor of FAIR-RITE, ensuring you receive genuine, high-quality components. This ferrite core, made from #77 material, offers superior magnetic characteristics. Its toroidal shape minimizes flux leakage and maximizes inductance. With dimensions of A=15.24mm, B=9.53mm, and H=6.35mm, this core is suitable for creating inductors, transformers, and chokes. The #77 material provides a good balance of permeability and core loss, making it suitable for applications operating at various frequencies. Trust Supreme Components International for all your FAIR-RITE component needs.