Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4 1 2 X 10 3 8IN X 24LBS found under Envelope Mailing by 3 Star Papers Limited. The National Stock Number assigned to this part is 7530002866971, 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 4 1 2 X 10 3 8IN X 24LBS.