Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number VK-21 found under Gage Profile by Van Keuren. The National Stock Number assigned to this part is 5220012810240, 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 VK-21.