Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RR-L-100 found under Ladder Safety Step by Federal Specifications. The National Stock Number assigned to this part is 5440000716847, and the Federal Supply Class is 5440 Scaffolding Equipment And Concrete Forms. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like RR-L-100.