Best Jobber Drill Bits for Drilling Stainless Steel (2026)
We selected jobber drill bits based on material (cobalt vs HSS), length/shank options, size range in sets, and value for stainless steel drilling
The Verdict
- Best Overall: BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Case — Best for M42 performance: cobalt alloy and three-flat shanks deliver durable cutting and secure chuck grip
- Best Value: 1/8" x 6" cobalt aircraft extension drill bit (12 pack) GLBCO — Best for reach: long 6-inch aircraft extension cobalt bits access deep or recessed holes while retaining heat resistance
This roundup evaluates jobber-length drill bits suited for drilling stainless steel, focusing on materials, length, and shank style to match metalworking needs. Picks were chosen from cobalt and high-speed steel options with attention to durability, fit for hand drills or drill presses, and overall value
Top Picks
-
1
Best Overall BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Case
Best for M42 performance: cobalt alloy and three-flat shanks deliver durable cutting and secure chuck grip
Cobalt M42 drill bits with a three-flat shank for drilling stainless steel, cast iron, titanium, and light-gauge metal. Durable, heat-resistant bits designed to extend life. Users note good quality and edge retention, with mixed durability reports
- 3-flat shank design
- Enhanced M42 cobalt alloy (8% cobalt)
- 14-piece set with included case
-
2
Drill America 1-1/2" Reduced Shank HS drill bit KFD series
Best for large reduced-shank holes: reduced shank design adapts large diameters to smaller chucks for heavy-duty cuts
High-speed steel drill bit with gold/black coating for wear resistance and versatile use in hard metals. Shows good hole accuracy with mixed feedback on durability and sharpness
- wear-resistant coating
- versatile toolholding compatibility
- split point for easier starting
-
3
Best Value 1/8" x 6" cobalt aircraft extension drill bit (12 pack) GLBCO
Best for reach: long 6-inch aircraft extension cobalt bits access deep or recessed holes while retaining heat resistance
Cobalt aircraft extension drill bit set designed for tough materials. 135° split point helps prevent walking and round shanks fit various tool holding systems. Customers note quality and ease of drilling; some report durability issues
- cobalt alloy for tough metals
- 135 split point reduces walking
- multiple material compatibility
-
4
3/16" x 6" cobalt aircraft extension drill bit (pack of 12)
Best for medium diameters at length: 3/16" by 6" cobalt extensions combine size versatility with extended reach
Cobalt drill bit with 3/16" diameter and 6" length, designed for tough materials. 135 split point helps prevent walking; round shanks fit various tool holders. Customers report sharp cuts and good value, with mixed durability reactions
- split-point design for starting accuracy
- coated cobalt for hardness
- versatile shank design
-
5
Drill America D/ACO cobalt heavy duty drill bit set (12)
heavy-duty option: cobalt construction and round-shank format supply robust drilling for tougher stainless tasks
Cobalt steel drill bits designed for harder metals with thin gold oxide coating and round shanks for versatile toolholding. Customers note sharp cuts, high durability, and good value
- coated for performance on hard metals
- round shank versatility
- aerospace-standard manufacturing