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๐Ÿ’ช efficient drilling with the 8 inch cobalt aircraft extension drill bit logo

๐Ÿ’ช Efficient Drilling with the 8 Inch Cobalt Aircraft Extension Drill Bit Review

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Revainrating 2.5 out of 5ย ย 
Ratingย 
2.3
๐Ÿชš Industrial Drill Bits, ๐Ÿ”ช Cutting Tools

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Description of ๐Ÿ’ช Efficient Drilling with the 8 Inch Cobalt Aircraft Extension Drill Bit

โœ”๏ธ COBALT DRILL BIT DIMENSION:1/8"(Diameter) x 1-5/8"( Flute Length) x 6"(Overall Length). โœ”๏ธ COBALT MATERIAL: HSS(M35) Cobalt Steel is the premium material with high hardness and red hardness to enable long drilling life and fast drilling performance. โœ”๏ธ SURFACE TREATMENT: The Gold Oxide Ember finished surface treatment strongthen the hardness of drill bit body to ensure the long drilling life and better drilling performance. โœ”๏ธ SPLIT POINT ANGLE 135 DEG.: No center punch is needed- the aggrevsive 135 deg. Split Point quick-cutting points are self- centering and penetrate quickly with less pressure. will not "walk" or"wander". โœ”๏ธ APPLICATION: Best used for drilling deep hole in metal, high-carbon steel, aluminum and alloy steel, cast iron, stainless steel and titanium.

Reviews

Global ratings 3
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  • 4
    0
  • 3
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    2

Type of review

Revainrating 1 out of 5

Do not buy! on twist drill bits

Terrible product! I ordered 3 packs but after receiving them I found that the 3 bits were bent but as soon as I started using them they started breaking - only drill into wood! I will never buy again, this is junk!

Pros
  • โœ”๏ธ APPLICATIONS: Best for drilling deep holes in metal, high carbon, aluminum and alloy steel, cast iron, stainless steel and titanium
Cons
  • write later

Revainrating 5 out of 5

Haven't tried it with metal but it's great with wood.

It was great! I make and assemble cabinets. I use them in the shop and in the field. I have tape on some for pre-drilling for a specific drilling depth. The length is great for pre-drilling pocket holes to avoid splitting and many other uses.

Pros
  • โœ”๏ธ SURFACE TREATMENT: Ember gold oxide surface treatment increases the hardness of the drill body for long life and better drilling performance.
Cons
  • The cable is shorter than others

Revainrating 1 out of 5

Got used bits, some cobalt some not#?!@%?!

I received five 6 inch bits but as you can see in the photo they are all used. The photo is what I saw when I opened the package. I hardly believed it. If you look closely, the one with drywall inside is clearly not cobalt, just a standard high-speed steel bit easily distinguishable on the surface. I bought the same set a few months ago and received five new cobalt bits which I have been completely satisfied with.

Pros
  • โœ”๏ธ COBALT MATERIAL: HSS (M35) Cobalt Steel is a high quality material with high hardness and red hardness for long life and fast drilling.
Cons
  • I don't remember but there was something