Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MJS23 found under Screwdriver Attachment Set Socke by Herbrand Tools Corp. The National Stock Number assigned to this part is 5120013176848, 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 MJS23.