Klein Tools 9-Step Drill Bit 3...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$104.09
$89.53
Klein Tools KTSB03 9-Step Drill Bit, 3/8-Inch Hex, Double Straight Flute, 1/4-Inch to 3/4-Inch

Klein Tools 9-Step Drill Bit 3/8-Inch Hex with AlTiN Coating 1/4-Inch to 3/4-Inch Professional Drilling System

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Model: KTSB03
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$104.09
$89.53
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Klein Tools 9-Step Drill Bit 3/8-Inch Hex with AlTiN Coating 1/4-Inch to 3/4-Inch Professional Drilling System

Professional step drilling solution with advanced coating technology

Klein Tools delivers professional-grade drilling performance with this 9-step drill bit featuring 3/8-inch hex shank and aluminum titanium nitride coating. Engineered for versatile applications on steel up to 16 gauge, wood, plastic, and aluminum, this high-speed steel bit provides precise hole sizing from 1/4-inch to 3/4-inch in 1/16-inch increments. The durable hex shank ensures positive grip without spinning, while the double straight flute design removes chips for clean cuts and efficient drilling.

Professional Features & Benefits

  • 9-Step Size Range: Covers 1/4-inch to 3/4-inch in precise 1/16-inch increments for versatile hole sizing without multiple bits
  • Aluminum Titanium Nitride Coating: Provides 10 times more durability than steamed black oxide coating for extended bit life and superior performance
  • 3/8-Inch Hex Shank: Delivers firm, positive grip in drill chucks and prevents spinning out during operation
  • Double Straight Flute Design: Efficiently removes chips and debris for clean cuts and smooth drilling action
  • High Speed Steel Construction: Ensures durability and maintains sharp cutting edges across multiple materials
  • Fast-Starting Non-Walking Tip: Provides precise hole placement and eliminates bit wandering on material surfaces
  • Laser Markings: Enable quick size identification for efficient workflow and accurate hole sizing

Technical Specifications

  • Coating: Aluminum Titanium Nitride (AlTiN)
  • Department: Electrical
  • Depth: 4.7700 in
  • Flute Type: Straight
  • Height: 0.1800 in
  • Increment: 1/16" (1.6 mm)
  • Material: High Speed Steel
  • Number Of Holes: 9
  • Overall Height: 2.8" (7.1 cm)
  • Overall Length: 0.75" (1.9 cm)
  • Overall Width: 0.75" (1.9 cm)
  • Product Details: Step Drill Bit
  • Product Group: Hand Tools
  • Product Size: 1/4" to 3/4" (6.4 to 19.1 mm)
  • Product Subgroup: Screwdrivers & Drivers
  • Product Type: Step Drill Bit
  • Quick Reference: #3
  • Shank Type: 3/8" Hex
  • Weight: 0.1500 lbs
  • Width: 3.0600 in

Professional Applications

  • Electrical installations and panel work
  • HVAC system installations
  • Plumbing and mechanical applications
  • General construction and maintenance
  • Automotive and fabrication work
  • Professional trade applications
  • Industrial maintenance operations

Why Choose Klein Tools Quality?

Klein Tools delivers professional-grade reliability with high-speed steel construction and advanced aluminum titanium nitride coating technology. The precision laser markings and durable 3/8-inch hex shank design ensure consistent performance across demanding applications, while the 9-step sizing capability provides versatile drilling solutions for professional tradespeople and contractors.

Manufacturer Resources

Spec Sheet

Product Specs

Coating:
Aluminum Titanium Nitride (AlTiN)
Flute Type:
Straight
Increment:
1/16" (1.6 mm)
Number Of Holes:
9
Overall Height:
2.8" (7.1 cm)
Overall Length:
0.75" (1.9 cm)
Overall Width:
0.75" (1.9 cm)
Quick Reference:
#3
Shank Type:
3/8" Hex
Department:
Electrical
Product Group:
Power Tools & Accessories
Product Subgroup:
Drill & Driver Bits
Product Type:
Step Drill Bit
Product Size:
1/4" to 3/4" (6.4 to 19.1 mm)
Product Details:
Step Drill Bit
Product Height:
0.1800 in
Product Material:
High Speed Steel
Product Weight:
0.1500 lbs
Product Width:
3.0600 in
Product Depth:
4.7700 in

Klein Tools KTSB03 – Frequently Asked Questions

1) What hole sizes does the Klein KTSB03 step bit cut?
The KTSB03 cuts nine hole sizes from 1/4 inch up to 3/4 inch, stepping in 1/16 inch (1.6 mm) increments. That covers the common conduit and connector openings in a sheet metal panel without swapping bits, and each step is laser marked so you can see which one you're in mid-cut.
2) How thick a steel panel can this step bit drill?
Steel up to 16 gauge is the rated limit for this Klein 9-step bit. That suits enclosure walls, junction boxes, strut and light sheet metal. For heavier plate or structural steel you want a different approach, since a step bit's steps are shallow and won't clear thicker stock cleanly.
3) Step bit or hole saw for drilling conduit knockouts in an enclosure?
For thin sheet steel up to 16 gauge a step bit is the faster call: one bit covers nine sizes from 1/4 to 3/4 inch, it self-starts without a pilot, and it deburrs the hole as the next step passes through. A hole saw needs a pilot bit, a separate saw for every diameter, and tends to grab in thin metal. Go to a saw or a knockout punch when you need openings larger than 3/4 inch or are cutting heavier stock.
4) Can I use this bit on anything besides steel?
Yes. Wood, plastic and aluminum are all in scope alongside 16 gauge steel. The high speed steel body with double straight flutes clears chips in softer materials, which is what keeps plastic from melting and grabbing on the step shoulder.
5) Is the AlTiN coating worth it over a plain black oxide step bit?
The aluminum titanium nitride coating on the KTSB03 is rated at 10 times the durability of steamed black oxide. The practical difference shows up in repeat production drilling, panel after panel, where an uncoated bit dulls on the first step and starts work-hardening the hole. For occasional single holes the difference matters less.
6) Do I need a center punch before drilling with this step bit?
Not usually. The tip is a fast-starting non-walking design, so it bites where you set it instead of skating across sheet metal. On a slick painted enclosure or a curved surface a punch mark is still cheap insurance.
7) How long is the Klein KTSB03 step bit, and will it reach into a panel?
Overall height on the bit is 2.8 inches (7.1 cm) and it weighs 0.15 lbs. That is a compact bit, fine for drilling a panel wall or box side from the open face, but it gives you little standoff, so plan on getting the drill body close to the work.
How fast can I get the Klein Tools KTSB03 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Klein Tools KTSB03 come with a warranty?
Absolutely. The Klein Tools KTSB03 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Klein Tools KTSB03?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Klein Tools KTSB03 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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