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Metal drill bit set in indexed case, 13 pieces, straw bronze finish

Chicago-Latrobe

Chicago-Latrobe 57851 13PC 135 Degree Cobalt Drill Bit Set

SKU CH-PRVR-11EZH

A 13-piece cobalt steel drill bit set with 135-degree points for heavy-duty jobber length drilling

  • Product typeDrill Bits
  • Main materialCobalt Steel
  • 13-piece set covers common drilling tasks
  • 135-degree split point reduces walking on hard materials
  • Cobalt steel construction resists heat during high-speed drilling
  • Jobber length provides reach for deeper holes
  • Straw bronze finish adds corrosion resistance

13-Piece Cobalt Drill Bit Set

This Chicago-Latrobe 57851 set contains 13 jobber length drill bits made from cobalt steel with a 135-degree point angle. The straw-bronze finish identifies the heavy-duty machining cobalt material. It is built for drilling tough metals where standard high-speed steel wears quickly.

For metalworkers drilling hard alloys

Machinists and fabricators working with stainless steel, cast iron or titanium will benefit from the heat resistance of cobalt steel. Woodworkers, plastics fabricators or anyone needing only occasional light-duty holes in soft materials will not need this level of performance.

135-degree split point for self-centering

The 135-degree point angle reduces walking on hard surfaces and starts the cut without a centre punch. This single geometry feature determines whether the set matches the drilling accuracy and material hardness you face daily.

How it compares

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

Price $43.99
Pricier than about 64% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE
Product typeDrill Bits
Size & build
Main materialCobalt Steel

Questions about this item

What chuck size do the 135-degree cobalt bits in the 57851 set require?

The 13-piece set uses jobber-length cobalt steel bits with a 135-degree split point; they fit any standard drill chuck that accepts the corresponding shank diameter of each bit.

How do I install a bit from the 57851 set without it slipping in the chuck?

Insert the straight shank fully into the keyless or keyed chuck, tighten securely on the flats if present, and verify the 135-degree point runs true before drilling to prevent walking.

When should I replace a bit from this 13-piece cobalt set?

Replace individual bits when the 135-degree split point becomes rounded, the straw-bronze finish shows blue temper discoloration from overheating, or the cutting lips chip during heavy-duty drilling.

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