Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21-10518 ITEM 34 found under Clamp Block by Mac Gregor Usa Inc. The National Stock Number assigned to this part is 5340014261676, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21-10518 ITEM 34.