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13 cobalt jobber drill bits gold oxide finish in metal case

Drill America

Drill America D/A13J-CO-SET 13 Piece Cobalt Jobber Drill Bit Set

SKU CH-YS0G-9GY5J

13-piece cobalt jobber drill bit set in metal case with gold oxide finish, round shank, spiral flute and 135-degree split point

  • Product typeDrill Accessories
  • Cobalt steel resists heat and wear
  • 13 jobber bits cover 1/16 to 1/4 by 64ths
  • 135-degree split point starts holes without walking
  • Gold oxide finish reduces friction and corrosion
  • Round shank fits standard drill chucks

13-Piece Cobalt Jobber Set

The Drill America D/A13J-CO-SET contains 13 cobalt steel jobber drill bits ranging from 1/16 to 1/4 inch in 64th increments. It is designed for mechanics and metalworkers who need durable bits for drilling hard materials such as stainless steel.

Gold Oxide Finish And Split Point

The gold oxide finish adds surface hardness and reduces friction during high-speed drilling. A 135 degree split point allows the bit to start on contact without walking, but the round shank limits torque transfer in heavy-duty applications.

Metal Case Keeps Bits Organised

The set ships in a metal case that protects the cutting edges during storage and transport. Round shanks fit standard three-jaw chucks, though users should verify chuck capacity for the largest 1/4 inch bit to avoid slippage.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $26.99
Typical for this category: the median of 5,493 items is $27.99.

Specifications

Product
Brand nameDrill America
Product typeDrill Accessories

Questions about this item

Which set should I choose if I need a range of fractional sizes?

This single 13-piece set covers the fractional range from 1/16 inch through 1/4 inch in 64th-inch increments, giving a complete progression in one case.

How does the 135-degree split point behave when drilling stainless steel?

The 135-degree split point self-centres on contact, cuts immediately without a pilot hole, and lowers the thrust needed to penetrate tough alloys.

Will the round shank fit every drill press and hand drill I own?

The round shank seats securely in any standard three-jaw chuck, so the bits work with common drill presses, corded drills and cordless models alike.

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