Aircraft Tool Supply Threaded Drill Bits #40, #30, #21, #12 (4-Pack)
Aircraft Tool Supply Threaded Drill Bits #40, #30, #21, #12 (4-Pack)
Package of four (4) 1/4-28 Threaded Drill Bits in sizes: 40, 30, 21, and 12. Cobalt steel with black oxide finish.