Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number IMFS320 found under Socket Socket Wrench by Snap On Tools Corp. The National Stock Number assigned to this part is 5130013489328, 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 IMFS320.