Drill America
Drill America 21 Piece Cobalt Jobber Drill Bit Set
21-piece cobalt jobber drill bit set with 135-degree split points and gold oxide finish in a metal case
- TypeDrill Accessories
- 21-piece set covers 1/16 to 3/8 inch by 64ths
- Cobalt steel resists heat and wear in tough metals
- 135-degree split point starts on contact without walking
- Gold oxide finish reduces friction and extends bit life
- Round shank fits standard drill chucks securely
21-Piece Cobalt Jobber Set
This 21-piece cobalt steel jobber drill bit set covers fractional sizes from 1/16 inch to 3/8 inch in 64th increments. The gold oxide finish resists wear and reduces friction during drilling. A 135-degree split point ensures accurate starts without a centre punch. Supplied in a metal case for organised storage.
Round Shank Fits Standard Chucks
The round shank design fits any standard three-jaw drill chuck without adapters. Cobalt steel handles high-heat drilling in stainless steel, cast iron and titanium alloys. Jobber length provides the reach for general-purpose hole making. The set frees you from buying individual bits for common fractional sizes.
Upgrades From High-Speed Steel Sets
Replaces general-purpose high-speed steel sets when drilling hard metals that dull standard bits quickly. The cobalt alloy retains hardness at higher temperatures, extending bit life in tough materials. The jump is worth it for workshops that regularly drill stainless steel or other abrasive alloys. Not for buyers who only drill wood, plastic or soft aluminium.
Highlights
- 21-piece set covers 1/16 to 3/8 inch by 64ths
- Cobalt steel resists heat and wear in tough metals
- 135-degree split point starts on contact without walking
- Gold oxide finish reduces friction and extends bit life
- Round shank fits standard drill chucks securely
Specifications
| Brand | Drill America |
|---|---|
| Type | Drill Accessories |
Questions about this item
What is the maximum drill bit size included in the 1/16 to 3/8 inch range?
The set covers sizes from 1/16 inch up to 3/8 inch in 64th increments.
Will the cobalt steel bits overheat during extended drilling in hard metal?
Cobalt steel resists heat better than standard steel, but continuous high-speed use requires cutting fluid and pauses to manage temperature.
Does the 135-degree split point need a centre punch to start accurately?
The 135-degree split point is self-centring and reduces walking, so a centre punch is not required for most materials.
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