Professional-grade tile cutting and laying tools, a great helper for home decoration/construction projects.

1/4 to 1-3/8 Inch Titanium Step Drill Bit 10 Steps Heavy Duty Two Flute Large Diameter Quick Change Unibit 1

1/4 to 1-3/8 Inch Titanium Step Drill Bit 10 Steps Heavy Duty Two Flute Large Diameter Quick Change Unibit 2

1/4 to 1-3/8 Inch Titanium Step Drill Bit 10 Steps Heavy Duty Two Flute Large Diameter Quick Change Unibit

1. Pro-Technician Unfiltered Verdict

"If you are an electrician cutting knockout holes in thick metal breaker boxes, or an HVAC tech running wide copper supply lines through heavy gauge panels, standard thin step bits are useless. They lack the low-end torque stabilization and their narrow profiles wobble violently when expanding to larger sizes.

Model:

TW-SDB4-1

MOQ::

500

Color::

Customizable

Lead Time::

30day-45day

Samples::

We can offer 1-2pcs samples

Customization::

OEM, ODM, Private Label Service

Payment Method::

T/T, L/C

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WHY CHOOSE US?

Product Characteristics

Creative Workshop Hacks: Get the Most Out of Your 1-3/8" Cone

To achieve zero-burr finishes and extend this premium bit's operational lifespan by up to 300% under demanding daily workloads, implement these hidden industry hacks:

1/4 to 1-3/8 Inch Titanium Step Drill Bit 10 Steps Heavy Duty Two Flute Large Diameter Quick Change Unibit 3

The Gravity-Drop Oil Method: When drilling large-diameter holes (especially from 1" up to 1-3/8"), do not spray thin WD-40. Use a thick, high-viscosity thread cutting oil. Let a few drops pool inside the wide flutes; as the bit spins, centrifugal force naturally forces the cooling lubricant directly into the leading edge.

1/4 to 1-3/8 Inch Titanium Step Drill Bit 10 Steps Heavy Duty Two Flute Large Diameter Quick Change Unibit 4

The Back-Side Edge Chamfer: Want a perfect, smooth edge on both sides of a sheet metal hole without bringing out a separate deburring tool? Once the 1-3/8" step punches through, simply back the drill out, flip the metal sheet over, and let the previous smaller step gently kiss the rear lip for 1 second. It creates an instant, professional safety chamfer.

1/4 to 1-3/8 Inch Titanium Step Drill Bit 10 Steps Heavy Duty Two Flute Large Diameter Quick Change Unibit 5

1/4 to 1-3/8 Inch Titanium Step Drill Bit 10 Steps Heavy Duty Two Flute Large Diameter Quick Change Unibit 6

Professional Maintenance & Sharpness Protocol

Large-diameter step drills handle massive amounts of metal friction. To prevent the titanium nitride (TiN) heat shield from peeling or burning out, follow this simple maintenance checklist:

Product Application

Strict RPM Down-Scaling: As you advance from the initial 1/4" tip down to the massive 1-3/8" final tier, you must slow down your drill's speed. High RPM on large steps increases friction speed exponentially, which instantly burns the outer cutting lips.
Swarf Clearing Intermissions: For holes deeper than 3mm in structural steel, pause halfway through the cut. Give the drill a quick trigger tap in mid-air to eject the thick curling metal ribbons caught inside the dual flutes before completing the final step.

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+86-13917053081

sale@shtengwei.com

Room 213, No. 389 Jinwan Road, Pudong New Area, Shanghai

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