Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number L21-58-8 found under by P P P Mfg Co Inc. The National Stock Number assigned to this part is 5930007149297, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like L21-58-8.