The SKB 3i-M6U20-FRM is a rugged and highly durable 6U injection-molded rack frame designed to fit 20-inch deep SKB iSeries waterproof cases, providing a secure and portable solution for mounting rack equipment. Constructed from high-strength, lightweight aluminum alloy with rack rails front and rear, the frame ensures excellent support and stability for a variety of AV, broadcast, and pro audio gear. Its open-frame design promotes efficient airflow and easy access to cables and connections, making it ideal for mobile setups or field applications. The frame installs quickly into compatible SKB iSeries cases using the included mounting hardware, transforming the case into a fully functional rackmount system that’s protected against impact, moisture, and dust.