Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CMA-428-6 found under Eyeshield Optical Instrument by Aerofab Company Inc Jules Bols. The National Stock Number assigned to this part is 1240013688736, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like CMA-428-6.