Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number QBT-506164 found under Holder End Mill by J And L Industrial Supply Co Inc. The National Stock Number assigned to this part is 3460003731359, and the Federal Supply Class is 3460 Machine Tool Accessories. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like QBT-506164.