Greenlee GSB04 7/8" Multi-Hole...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$132.21
$85.35
Greenlee GSB04 7/8" Multi-Hole Step Bit (#4) Metal Cutting Tool with 12 Drill Stages

Greenlee GSB04 7/8" Multi-Hole Step Bit (#4) Metal Cutting Tool with 12 Drill Stages

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Model: GSB04
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$132.21
$85.35
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Greenlee GSB04 7/8" Multi-Hole Step Bit (#4) Metal Cutting Tool with 12 Drill Stages

Professional multi-material cutting solution with patented split-step design

The Greenlee GSB04 7/8" Multi-Hole Step Bit delivers professional-grade cutting performance across mild steel, aluminum, brass, copper, wood, fiberglass, plastics and laminates. Featuring a patented split-step design with 12 drill stages ranging from 3/16" to 7/8", this metal cutting tool optimizes chip load for fast, smooth cutting and maximizes holes per charge. The three-flat shank design ensures compatibility with all 1/2" drill chucks for versatile professional applications.

Professional Features & Benefits

  • 12 Drill Stages: Provides versatile sizing from 3/16" to 7/8" diameter for multiple hole requirements in a single tool
  • 10 Gauge Sheet Metal Capacity: Handles up to 3.5mm thickness for demanding metalworking applications
  • Progressive Cutting Edges: Balanced aggression maximizes torque efficiency and minimizes stalling during operation
  • Improved Double Flute Design: Superior chip evacuation enhances cutting speeds and extends tool life
  • Durable Split-Point Tip: Ensures fast, accurate material penetration for precise hole placement
  • Three-Flat Shank: Universal compatibility with all 1/2" drill chucks for professional versatility
  • USA Manufacturing: Made in United States for consistent quality and reliability

Technical Specifications

  • Country Of Origin: United States
  • Maximum Drill Diameter: 7/8" (22.2 mm)
  • Maximum Sheet Metal Thickness: 10 gauge (3.5 mm)
  • Minimum Drill Diameter: 3/16" (4.8 mm)
  • Number Of Drill Stages: 12
  • Product Type: Multi-hole Step Bit

Installation & Operation

  1. Mount the step bit securely in a compatible 1/2" drill chuck using the three-flat shank design.
  2. Select appropriate drilling speed based on material type and thickness specifications.
  3. Position the split-point tip at the desired hole location for accurate material penetration.
  4. Apply steady pressure while allowing the progressive cutting edges to advance through material stages.
  5. Monitor chip evacuation through the double flute design and adjust speed as needed for optimal performance.
  6. Complete drilling operation and inspect hole quality before proceeding to next application.

Professional Applications

  • Electrical panel and enclosure fabrication
  • HVAC ductwork and sheet metal installation
  • Plumbing and mechanical system modifications
  • Industrial maintenance and repair operations
  • Construction and renovation projects
  • Automotive and equipment service work
  • General metalworking and fabrication tasks

Why Choose Greenlee Quality?

Greenlee’s patented split-step design and USA manufacturing ensure reliable performance across demanding professional applications. The laser markings provide quick product identification, while the durable construction and improved flute design deliver extended tool life and consistent cutting performance for professional tradespeople and contractors.

Manufacturer Resources

Product Specs

Country Of Origin:
United States
Maximum Drill Diameter:
7/8" (22.2 mm)
Maximum Sheet Metal Thickness:
10 gauge (3.5 mm)
Minimum Drill Diameter:
3/16" (4.8 mm)
Number Of Drill Stages:
12
Product Type:
Step Drill Bit
Department:
Electrical
Product Subgroup:
Hole Saws & Bits
Product Group:
Power Tools & Accessories

Greenlee GSB04 – Frequently Asked Questions

1) What hole sizes will the Greenlee GSB04 step bit cut?
The GSB04 steps from 3/16 inch up to 7/8 inch (4.8 mm to 22.2 mm) across 12 stages, so one bit covers most of the common knockout and conduit-pilot sizes you need in a panel or enclosure. If you need a hole larger than 7/8 inch, this is the wrong bit and you want a larger step bit or a knockout punch.
2) Will the GSB04 step bit fit my drill, or do I need a special chuck?
It has a three-flat shank that fits any 1/2 inch drill chuck, corded or cordless. No adapter, no collet, nothing else to buy. The three flats keep it from spinning in the jaws when the larger steps load up.
3) How thick a sheet metal can a Greenlee GSB04 step bit go through?
Rated to 10 gauge, which is 3.5 mm. That covers strut, enclosure walls, junction box bodies, and HVAC duct without trouble. Heavier plate than 10 gauge is past the bit's rating; a step bit only cuts as deep as its step land is wide, so going thicker binds the step rather than cutting cleanly.
4) Can I use this step bit on anything besides steel?
Yes. The GSB04 is rated for mild steel, aluminum, brass, copper, wood, fiberglass, plastics and laminates. That is why it is a common one-bit solution for mixed work, drilling a plastic wireway and a steel enclosure on the same install. It is not rated for stainless or hardened plate.
5) Step bit or hole saw for drilling electrical enclosures?
For sheet metal up to 10 gauge, a step bit like the GSB04 is the better choice: it self-starts off the split-point tip, needs no pilot hole or arbor, deburrs as it steps, and gives you 12 sizes from 3/16 to 7/8 inch in one tool. A hole saw makes sense when you need diameters beyond 7/8 inch or you are cutting thick stock, where a step bit's step land runs out of depth.
6) Which Greenlee step bit number is the 7/8 inch one?
It is the #4 size, ordered as part number GSB04. Greenlee numbers its multi-hole step bits by size range, and the #4 is the one topping out at 7/8 inch with 12 stages.
7) Do I have to drill a pilot hole before using this step bit?
No. The GSB04 starts on its own from the split-point tip, which is why it is quick on enclosure and duct work where you are only marking a center punch. Set the tip on your mark, run steady pressure, and let each step advance rather than forcing it.
8) Why does the GSB04 bog down less than a cheap step bit in the same hole?
Two things in the design: the patented split-step geometry staggers the cutting edges so the chip load stays balanced instead of the full circumference biting at once, which keeps torque demand down and reduces stalling, and a double flute clears chips out of the hole so the bit is not recutting its own swarf. On a cordless drill that also means more holes per battery charge.
9) Is the Greenlee GSB04 made in the USA?
Yes, country of origin is the United States. That matters if you are buying on a government, federal, or institutional contract with domestic-sourcing requirements on tooling.
10) How do I tell which step I am on mid-hole?
Each stage carries laser markings on the bit body, so you can read the diameter at the step you are cutting and stop at the right size instead of eyeballing it. Useful when you are running several different connector sizes in one panel.
How fast can I get the Greenlee GSB04 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 Greenlee GSB04 come with a warranty?
Absolutely. The Greenlee GSB04 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 Greenlee GSB04?
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 Greenlee GSB04 from ZenSupply?
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