Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 10310B found under Step Ladder by Wing Enterprises Incorporated. The National Stock Number assigned to this part is 5440016080019, 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 10310B.