Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SX24 found under Extension Socket Wrench by Snap On Uk Holdings Ltd T A Snap On. The National Stock Number assigned to this part is 5120001041738, 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 SX24.