Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 11 1-1 4 found under Tee Railing by Hollaender Manufacturing Co The. The National Stock Number assigned to this part is 5670011520973, and the Federal Supply Class is 5670 Building Components Prefabricated. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 11 1-1 4.