Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TB19 found under Level Precision Master by Taylor Hobson Inc. The National Stock Number assigned to this part is 5220007821908, and the Federal Supply Class is 5220 Inspection Gages And Precision Layout Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like TB19.