Drill 13 hole sizes with just 3 bits.

#21 Diameter 6" long Aircraft Extension Drill Bit. Made of high speed steel.

#21 Diameter 12" long Aircraft Extension Drill Bit. Made of high speed steel.

#12 (0.1890") Diameter. 1.900" Working Length. 2.150" Body Length. 1/4-28 thread. Made of extra durable Cobalt Steel. Also used as replacement bit for the rivet removal tools (1341A & 1341S).

1/8" (0.1250), 135 degree split point. High speed steel. 12" Aircraft Extension series

1/2" (0.5000), 135 degree split point. High speed steel. 12" Aircraft Extension series

13/32" (0.4063), 135 degree split point. High speed steel. 12" Aircraft Extension series

5/16" (0.3125), Cobalt, 135 degree split point, jobbers length. Overall length 4-1/2". Pack of 6 each.

3/16" (0.1875), 135 degree split point. High speed steel. 6" Aircraft Extension series

U (0.3680), Cobalt, 135 degree split point. Overall length 5"

#19 (0.1660), Cobalt, 135 degree split point, jobbers length. Overall length 3-1/4". Pack of 12 each.

1/8" (0.1250") Diameter. 2.400" Working Length. 2.750" Body Length. 1/4-28 thread. Made of High Speed Steel