Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C313 found under Cutter Counterbore by Wright Machine And Tool Co Inc. The National Stock Number assigned to this part is 5133003570132, and the Federal Supply Class is 5133 Drill Bits Counterbores And Countersinks Hand And Machine. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like C313.