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Thirteen cobalt drill bits in a plastic indexed storage case

Olympia Tools 13Pcs Cobalt Drill Bit Set 1/16-1/4 M35 HSS Index Case

SKU CH-WCF0-BSBJ2

Thirteen M35 cobalt twist bits from 1/16 to 1/4 inch with 135-degree tips cut hardened steel, stainless, cast iron, wood and plastics, stored in a plastic indexed case

  • Main materialPlastic
  • Sold asSet
  • Key featuresWidely Use
  • Number of items2 pack
  • Drills 13 sizes from 1/16 to 1/4 inch
  • M35 cobalt steel cuts hardened metal and stainless steel
  • 135-degree split point centres itself and speeds chip removal
  • Plastic indexed case keeps bits organised and upright
  • Suitable for steel, aluminium, wood and plastics

13-Piece Cobalt Drill Bit Set

The Olympia Tools set contains 13 M35 cobalt high-speed steel twist bits ranging from 1/16 inch to 1/4 inch. It is aimed at professional tradespeople, DIY enthusiasts and amateur craftsmen who need a single kit for drilling stainless steel, cast iron, aluminium, wood and plastics.

135-Degree Split-Point Geometry

Each bit uses a 135-degree tip angle that self-centres to prevent walk-off and clears chips quickly. The cobalt alloy holds its edge in hard metals, yet the same geometry limits aggressive feed rates in very thick stainless or hardened tool steel where carbide would be required.

Indexed Storage Case Included

The plastic index case holds all 13 bits upright for quick size identification and protects the cutting edges during transport. The set covers common pilot and clearance holes up to 1/4 inch; larger diameters or extended-length drilling are outside its range.

How it compares

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

Price $15.99
Cheaper than about 73% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameOlympia Tools
Part numberTWS-CS13SET
Size & build
Main materialPlastic
In the box
Number of items2 pack

Questions about this item

Should I pick the 13-piece M35 cobalt set or the 2-pack version for general workshop use?

The 13-piece set covers sizes from 1/16 to 1/4 inch in 64th increments and includes a plastic indexed case for organisation; the 2-pack simply doubles that same assortment.

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

The 135-degree tip self-centres to prevent walk-off, cuts faster with less pressure, and clears chips efficiently in tough alloys such as stainless steel and cast iron.

What shank standard do these jobber-length bits use and what chuck size do they require?

Each bit has a straight round shank matching its flute diameter, so the largest 1/4-inch bit needs a 1/4-inch or larger three-jaw chuck while smaller sizes fit correspondingly smaller chucks.

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