The Centralab (CRL) 1451 is a commercial-grade 4-pole, 2-position non-shorting Perma Switch assembly integrated with a broad-base volume control housing. Designed for vintage radio receiver, transceiver, and test equipment restoration, this unit features a 2-3/4 inch broad base with 1/4-inch spacing between sections. The control shaft measures 3/4 inches in length, featuring a 3/4-inch outer round profile with a 1/4-inch inner flat interface for secure drive engagement and smooth mechanical indexing.