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Cle-Line cobalt left-hand drill bit, straw finish, mechanics length

Cle-Line

Cle-Line C30528 135 Degree Cobalt Left-Hand Mechanics Length Drill Bit

SKU CH-E28J-58C1K

A 7/16 inch cobalt drill bit with a 135-degree left-hand cutting angle for mechanics-length drilling

  • 135-degree split point starts on contact for accurate holes
  • Cobalt construction resists heat and wear in tough alloys
  • Left-hand flute clears chips when removing broken fasteners
  • Mechanics-length body gives rigidity in confined spaces
  • Straw finish reduces friction for smoother cutting

Cle-Line Cobalt Left-Hand Drill Bit

The Cle-Line C30528 is a mechanics-length drill bit made from cobalt with a 135-degree point angle. It is designed for machine drilling in tough materials where a left-hand rotation is required. The fractional-inch sizing suits maintenance and repair tasks in automotive or industrial settings. A straw finish identifies the surface treatment.

Suited for reverse drilling and extractor prep

This bit suits technicians who need left-hand rotation for broken fastener removal or screw extractor preparation. The cobalt construction handles high-heat drilling in stainless steel or hardened alloys. Builders who require standard right-hand cutting action should look at something else. Users needing jobber or taper-length flute geometry will not find it here.

135-degree split point starts on contact

The 135-degree point angle is the specification that decides fit for the application. It reduces walk on hard surfaces and improves centering without a pilot hole. The .4375 inch diameter matches 7/16 inch fractional requirements exactly. Cobalt material maintains hardness at elevated drilling temperatures.

How it compares

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

Price $9.99
Cheaper than about 88% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLE-LINE

Questions about this item

What does the 135-degree split point do on this cobalt drill bit?

The 135-degree split point reduces walking and starts the hole faster on hard metals.

What shank size fits the 7/16-inch mechanics-length bit?

The shank is reduced to fit standard 3/8-inch chucks while the flute remains 7/16 inch.

How do you avoid snapping the left-hand flutes when extracting a broken bolt?

Run the drill in reverse at low speed with steady pressure; high RPM or lateral force shears the cobalt flutes.

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