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  • Precision Twist C20R18 High Speed Steel Jobber Length Drill Bit Set with Metal Case, Black Oxide Finish, 118 Degree Conventional Point, Wire Size, 20 piece, #80 to #60
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Precision Twist C20R18 High Speed Steel Jobber Length Drill Bit Set with Metal Case, Black Oxide Finish, 118 Degree Conventional Point, Wire Size, 20 piece, #80 to #60

1 customer review

List Price: $71.00
Price: $48.82 & FREE Shipping. Details
You Save: $22.18 (31%)
Only 2 left in stock (more on the way).
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Specifications for this item
Brand Name Precision Twist
Part Number 99981
Material Type High-Speed Steel
Finish Types Black Oxide
Number of Items 1
UPC 086071999818
Cutting Angle 118  Degrees
Cutting Direction Right-Hand
Drill Point conventional
EAN 0086071999818
Flute Type Spiral
Manufacturer Series Number C20R18
Shank Type Round
Size #80 - #60
Style Name Jobber
System of Measurement Wire Gauge
UNSPSC Code 20121600

This Precision Twist C20R18 jobber length drill bit set contains 20 high-sp... Read full product description



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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
  • Black oxide finish reduces bit wear while promoting chip and coolant flow on ferrous material
  • 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: B002069W10
  • Item model number: 099981
  • Average Customer Review: 5.0 out of 5 stars  See all reviews (1 customer review)
  • Amazon Best Sellers Rank: #224,352 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 C20R18 jobber length drill bit set contains 20 high-speed steel drill bits, including one each of wire gauge sizes #80 through #61, with a black oxide finish and a 118-degree conventional point for use in general-purpose applications on ferrous material. High-speed steel (HSS) provides hardness for wear resistance, and the black oxide finish acts as a lubricant to reduce wear while promoting chip and coolant flow. 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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I was influenced by the price when I bought these, but for the price they are excellent. In particular, there is no wobble when I use them in a Dremel tool, and for most applications drilling small holes in soft materials, they work extremely well in a ball pin vice (I prefer one with a wood handle for comfort). The bits remain in their slots well if handled normally; the only help for you if you spill them is a couple of hours with a digital micrometer! I may transfer the bits to individually labeled tubes. If you have a project where you need to use more than one bit at a time repeatedly, I'd buy additional pin vices and label them.
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