Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 491PZDX found under Bit Screwdriver by Cooper Tools Inc. The National Stock Number assigned to this part is 5130016030730, 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 491PZDX.