The Fair-Rite 7878400721 is a Toroid Core designed for a wide range of applications, including inductors, transformers, and chokes. Supreme Components International, an authorised distributor of Fair-Rite components, provides this high-quality core to meet your design needs. Constructed from Material 78, this toroid core offers excellent performance characteristics. Its dimensions are A=12.7mm (outer diameter), B=7.4mm (inner diameter), and H=4.75mm (height). Choose Fair-Rite cores for superior performance and reliability in your electronic circuits. Supreme Components International ensures you receive genuine components with prompt delivery and excellent customer support. This core is perfect for applications requiring compact size and efficient magnetic properties.