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Twist Drill Bit Reduced Shank
Twist Drill Bit Reduced Shank Details
Twist Drill Bit Reduced Shank Details 01
Twist Drill Bit Reduced Shank Details 02
Twist Drill Bit Reduced Shank Details 03

Twist Drill Bit Reduced Shank

(Size: 13.5-25mm) - Free Shipping
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HSS Nitride Twist/Gun Drill Bit Reduced Shank 1/2''

Reduced-shank drill bits have a shank with a smaller diameter than their cutting head. They can drill large holes while still being compatible with standard sizes of drill chucks on handheld drills. Reduced-shank drill bits are used in maintenance and repair applications.

Package & Shipping:

  • Free shipping all over the world
  • 1pc Reduced Shank Drill Bit
  • To Korea, Japan : it take about 7-10 days
  • To USA, CA, Spain, France, Poland, Belgium, Portugal, United Kingdom, Germany, Italy and Netherlands: it take about 12 - 20days
  • To other European countries and Ukraine,Belarus,Russian Federation: it take about 15-30 days
  • To other countries: it take about 20-35 days


  • Large diamter bits with smaller shanks to enable use in standard drill chucks.
  • Using high-quality high-speed steel, through special treatment, processed iron, steel, plastic, wood,copper, aluminum and other metal materials.


  • Type: Gun Drill Bit
  • Material: High Speed Steel
  • Coating: Nitride
  • Shank: 1/2''(12.7mm)

What is Gun Drilling?

Gundrilling is a deep hole drilling process that uses a long, thin cutting tool to produce holes in metal at high depth-to-diameter ratios. Gun drilling is effective in diameters from 1 – 50 mm [0.04 – 2.00 in]. A gundrill tool differs from a conventional twist drill by its unique head geometry; a standard gundrill has a single effective cutting edge that removes chips as it advances into a metal workpiece.

The gundrilling process is able to drill deep holes beyond what is possible with conventional machinery and tooling such as twist drills, by using high pressure coolant for clean chip exhaust, even at extreme depths.

gundrilling-tooling-detailGun drilling was initially developed for the manufacture of gun barrels, where both straightness and barrel durability were essential to properly functioning barrels. The gundrilling process and tooling have been refined for maximum performance and use on modern, dedicated machinery. Firearms continue to be a common application for gundrilling. Other industries include diesel fuel components, medical tooling, plastic injection molds, and more.

Gun drilling can be done, with limited performance, on common CNC machines. Holes with a depth-to-diameter ratio of 20:1 or greater generally require dedicated equipment to achieve the highest productivity and process reliability, and can reach extreme ratios of 400:1 or greater.