Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CASD-61-1 found under Drill Twist by Fatigue Technology International. The National Stock Number assigned to this part is 5133013720287, 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 CASD-61-1.