Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number Z33-A found under Holder Handset by Comdial Business Communications Corp. The National Stock Number assigned to this part is 5965006429879, and the Federal Supply Class is 5965 Headsets Handsets Microphones And Speakers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like Z33-A.