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Clear case holding 115 cobalt jobber drill bits

Drill America

Drill America DWD115J-CO-SET 115 Piece Cobalt Jobber Drill Bit Set

SKU CH-1X7Q-N7DBD

115 cobalt jobber drill bits for high-tensile materials like stainless steel and titanium with 135-degree split points preventing walking and allowing 30% faster speeds than M2 steel

  • Product colorTransparent
  • 115 cobalt bits handle cast iron, stainless steel and titanium
  • 135° split point prevents walking for accurate hole starts
  • 30% faster drilling speeds than conventional M2 high speed steel
  • Jobber length with round shank fits standard chucks and holders
  • California Proposition 65 warnings for cancer and reproductive harm

Cobalt Jobber Drill Bit Set

The Drill America DWD115J-CO-SET contains 115 cobalt jobber length drill bits for drilling tough, high tensile strength materials. It handles cast iron, inconel, stainless steel and titanium effectively. The bits suit professional mechanics and fabricators who need reliable performance on hard metals. They are not for buyers who only drill wood, plastic or soft aluminium.

Thermals Noise Power

These hand tools generate no operational heat, noise or electrical power draw during normal use. Cutting temperatures depend on the workpiece material, drilling speed and coolant applied by the operator. The cobalt construction retains hardness at elevated temperatures better than conventional M2 high speed steel. They do not suit users who need powered tool specifications.

Accessories And Software

The set includes a transparent case that organises all 115 pieces for quick selection and storage. A 135° split point tip on each bit provides fast penetration and accurate drilling without walking compared to a conventional 118° tip. Cobalt allows speeds up to 30% greater than standard high speed steel. No software or digital accessories are bundled.

How it compares

Measured against everything we stock in Ratchets, Sockets & Drive Tools, at today’s prices. Recalculated every night.

Price $271.99
Pricier than about 91% of the 418 comparable items (median $20.99).

Specifications

Product
Brand nameDRILL AMERICA
Product colorTransparent

Questions about this item

How do I install the drill bits and what step is commonly missed?

Insert the round shank into the chuck and tighten securely; the step often missed is ensuring the 135° split point tip is centred before drilling to prevent walking.

What maintenance or replacement will the cobalt bits need over time?

The cobalt jobber bits resist wear in high tensile materials; resharpen the 135° split point when cutting slows, and replace individual sizes from the 115 piece set as they dull.

What limit appears first during sustained drilling with these bits?

Heat buildup is the first limit; cobalt's high red hardness allows speeds up to 30% greater than M2 steel, but continuous use still requires cooling breaks to maintain the 135° tip geometry.

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