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  • Precision Twist C20R18P High Speed Steel Jobber Length Drill Bit Set, Uncoated (Bright) Finish, 118 Degree Conventional Point, Wire Size, 20 piece, #80 to #61
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Precision Twist C20R18P High Speed Steel Jobber Length Drill Bit Set, Uncoated (Bright) Finish, 118 Degree Conventional Point, Wire Size, 20 piece, #80 to #61

2 customer reviews

List Price: $77.90
Price: $50.12 & FREE Shipping. Details
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Only 5 left in stock (more on the way).
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Specifications for this item
Brand Name Precision Twist
Part Number 90161
Material Type High-Speed Steel
Finish Types Uncoated (Bright)
Number of Items 1
UPC 086071901613
Cutting Angle 118  Degrees
Cutting Direction Right-Hand
Drill Point conventional
EAN 0086071901613
Flute Type Spiral
Manufacturer Series Number C20R18P
Shank Type Round
Size #80 - #60
Style Name Jobber
System of Measurement Wire Gauge
UNSPSC Code 20121600

This Precision Twist C20R18P jobber length drill bit set contains 20 high-s... Read full product description



Product Features

  • Set of 20 jobber length drill bits includes one each of wire gauge sizes #80 through #61
  • High-speed steel (HSS) provides hardness for wear resistance
  • Uncoated (bright) finish is an untreated surface that can be used on a range of materials, especially soft metals
  • 118-degree conventional point for a range of drilling applications
  • Drill bits conform to ANSI standards


Product Details

  • Shipping Weight: 1.1 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B0020997AS
  • Item model number: 090161
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (2 customer reviews)
  • Amazon Best Sellers Rank: #200,717 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Product Description

This Precision Twist C20R18P jobber length drill bit set contains 20 high-speed steel drill bits, including one each of wire gauge sizes #80 through #61, with an uncoated (bright) finish and a 118-degree conventional point for use in general-purpose applications on a range of materials, especially soft metals. High-speed steel (HSS) provides hardness for wear resistance, and the uncoated (bright) finish provides an untreated surface. These jobber length drill bits have a drilling depth up to four times their diameter. The round shank accommodates most drill chucks. The set comes in a metal index case with labeled compartments for identification and organization. Drill bits conform to American National Standards Institute (ANSI) standards.

Drill bits are cutting tools used to make holes in a range of materials using machines such as handheld portable drills, machining centers, and lathes. Drill bits come in a variety of lengths and types, the most common of which is the twist drill bit. The round, twisted shaft of the twist drill bit typically has two cutting edges and flutes. The helical twist of the flutes brings chips up and away from the cutting edges and allows for coolant to reach the cutting edges. Jobber length twist drill bits, the most common length of twist drill bit, offer a good compromise of length and reach to work with the widest range of materials and applications. Mechanic's length twist drill bits (also called maintenance length) are a little shorter than jobber length and less prone to deflection when drilling. Short length twist drill bits (also called stub or screw-machine length) are the shortest and stiffest twist drill bits, helping to reduce the chance of deflection or breakage when drilling. Reduced shank drill bits (also called Silver and Deming drill bits) have a shank that is smaller in diameter than its shaft, permitting drilling machines with either a 1/2" or 3/4" drill chuck to create large holes. Long length twist drill bits (also called taper length) are a little longer than jobber length, allowing for deeper holes and longer reach. Extra long twist drill bits (also called extension) are longer than long length twist drill bits for greater reach or for drilling deeper holes.

Precision Dormer manufactures cutting tools under the brands Precision Twist, Dormer, and Union Butterfield. The company, headquartered in Crystal Lake, IL, meets International Organization for Standardization (ISO) standards 9001 and 14000.

What’s in the Box?

  • 20 drill bits, one each of wire gauge sizes #80 through #61
  • Metal case


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Most Helpful Customer Reviews

2 of 2 people found the following review helpful By R. Dick on August 14, 2011
Verified Purchase
I've used these bits to drill carburetor high speed air bleeds ect to size and they have performed well drilling the brass those jets are made of.

I've also measured every bit with a precision device and found them to be accurate in size with in the resolution of my measuring tool of +-.0005"

One thing to keep in mind is that by most drill charts all of these bits need to be turned at 10,000 RPM plus, a pin vice or other low speed drill isn't going to work very well, if at all. These smaller bits must be turned at a very high speed with only light pressure to work properly. Turning them too slow in a higher torque drill encourages the use of excessive feed pressure that leads to broken bits.
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Verified Purchase
The drill bits arrived in a huot index with the word "precision" nowhere to be found. It arrived in an envelop that had the Precision stock number, but there was no way to know for sure that it was made by Precision.
Furthermore, it was made in France, not the US.
As far as the drill bit quality, they seemed good - I looked at them under a microscope.
Overall, I'm satisfied, but I'd feel better if it was made in the USA and if it had the word Precision somewhere so that I knew for sure what I was buying.
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