Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CP505E-12 found under Protractor Mechanics Plain by Starrett L S The Co Starrett Granite. The National Stock Number assigned to this part is 5210016576786, and the Federal Supply Class is 5210 Measuring Tools Craftsmens. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like CP505E-12.