Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 579B found under Gage Telescoping by Ls Starrett Company The. The National Stock Number assigned to this part is 5210002212085, 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 579B.