Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 918 13 found under Drill Twist by Cleveland Twist Drill Co. The National Stock Number assigned to this part is 5133001899258, 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 918 13.