#30 (0.1285) Diameter. 0.250" Working Length. 0.375" Body length. 1/4-28 thread. Made of extra durable Cobalt Steel.

#10 (0.1935") Diameter. 1.100" Working Length, 1.350" Body Length. 1/4-28 thread. Made of extra durable Cobalt Steel.

1/8 (0.125) Diameter. 1.000" Working Length. 1.250" Body length. 1/4-28 thread. Made of extra durable Cobalt Steel.

3/32" (0.0938), Cobalt, 135 degree split point, jobbers length. Overall length 2-1/4"

1/4" (0.2500") Diameter. 1.900" Working Length. 2.150" Body Length. 1/4-28 thread. Made of extra durable Cobalt Steel.

Complete drill index with storage case. M35 Cobalt steel with 135 degree spilt point. Bright Finish.

1/8" (0.1250), Cobalt, 135 degree split point, jobbers length. Overall length 2-3/4". Pack of 12 each.

#11 (0.1910), Cobalt, 135 degree split point, jobbers length. Overall length 3-1/2"

3/32" (0.0938), Cobalt, 135 degree split point, jobbers length. Overall length 2-1/4". Pack of 12 each.

#10 (0.1935), 135 degree split point. High speed steel. 12" Aircraft Extension series

Lasts 6 times longer versus the competition! M35 grade Cobalt HSS. Radial concave flute. 3-flatted shank. Speedpoint tip.

Unibit Step Drill Bit, Cobalt HSS, 1/4" to 3/4", 9 Hole Sizes, 3/8" Shank IRWIN Unibit Cobalt is made of high speed steel, this step drill bit will last longer in the toughest of materials. Best suited for maintenance and repair work.