Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number W661-2-1-2 found under Light Extension by Federal Specifications. The National Stock Number assigned to this part is 6230002995917, and the Federal Supply Class is 6230 Electric Portable And Hand Lighting Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like W661-2-1-2.