Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 7891-77REVCPC21 found under Pliers Retaining Ring by Electric Boat Corp. The National Stock Number assigned to this part is 5120002930047, and the Federal Supply Class is 5120 Hand Tools Nonedged Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 7891-77REVCPC21.