Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ZT286-17 1 16 IN found under Cutter Countersink by Zephyr Manufacturing Co Inc. The National Stock Number assigned to this part is 5133011019201, 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 ZT286-17 1 16 IN.