Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number H3221 found under Bit Screwdriver by Zephyr Manufacturing Co Inc. The National Stock Number assigned to this part is 5130004178216, and the Federal Supply Class is 5130 Hand Tools Power Driven. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like H3221.