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Thirteen gold cobalt drill bits in a metal index storage case

Olympia Tools Cobalt Drill Bit Set 13Pcs M35 135° Split Point with Index Storage Case

SKU CH-K3PN-68F2V

13-piece M35 cobalt drill bit set with 135° split points for hardened metals and stainless steel

  • Fit and compatibilityOut-Opening, Narrow Stile, Store Front Doors
  • Main materialPlastic
  • Sold asSet
  • Key featuresWidely Use
  • Number of items2 pack
  • Drills hardened metals with M35 cobalt alloy
  • 135° split point centres itself without walking
  • 13 piece set covers 1/16" to 1/4" sizes
  • Bronze steam finish resists wear and corrosion
  • Index storage case keeps bits organised

13-Piece Cobalt Drill Bit Set

This 13-piece set contains M35 cobalt alloy bits ranging from 1/16 inch to 1/4 inch. It is designed for professionals and DIY users who need to drill hardened metals, stainless steel, cast iron, alloys, wood and hard plastics. The jobber length twist design suits general purpose drilling tasks across these materials.

Index Storage Case Included

The metal index box organises every bit by size for quick identification and access. Bronze steam surface treatment on each bit adds wear and corrosion resistance while the fully ground twist reduces friction during use. This packaging protects the cutting edges during transport and storage.

135° Split Point for Self-Centering

The 135 degree split point centres automatically and penetrates quickly with less pressure applied. Thick web construction strengthens the core for durability in tough materials like stainless steel and cast iron. Builders needing sizes beyond 1/4 inch or specialised step drill profiles will require a different kit.

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 numberMHZ-43-13S
Size & build
Main materialPlastic
Compatibility
Fit and compatibilityOut-Opening, Narrow Stile, Store Front Doors
In the box
Number of items2 pack

Questions about this item

Will the M35 cobalt bits need resharpening after drilling hardened stainless steel?

The 135° split point is fully ground for sharp, self-centering cuts; the thick web design resists wear, but resharpening will eventually be needed once the cutting edges dull.

What limits continuous drilling in cast iron with the 1/4" bit?

Heat buildup at the tip is the first limit; the bronze steam surface treatment adds wear resistance, yet sustained pressure without coolant will overheat the cutting edge.

How much heat does the set generate during all-day use in a drill press?

The cobalt alloy and split-point geometry reduce friction, so heat stays manageable with proper speed and cutting fluid; the metal index case also acts as a heat sink between bits.

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