Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1D1B3 found under Knob by Electronic Hardware Corp. The National Stock Number assigned to this part is 5355004194732, and the Federal Supply Class is 5355 Knobs And Pointers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1D1B3.