Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B40503-2T found under Sling Multiple Leg by I And I Sling Inc. The National Stock Number assigned to this part is 3940015037019, and the Federal Supply Class is 3940 Blocks Tackle Rigging And Slings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B40503-2T.