Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EX2007-1B3B found under Sleeving Textile El by Drs Sustainment Systems Inc. The National Stock Number assigned to this part is 5970008351183, and the Federal Supply Class is 5970 Electrical Insulators And Insulating Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like EX2007-1B3B.