Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 90039 found under Knife Putty by Lutz File And Tool Co. The National Stock Number assigned to this part is 5120014306809, 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 90039.