Do these hold up to heavy use on stainless steel?

Sadly to say that it does not hold up to stainless steel. I am an Exterior Electrician and ordered a bunch of these for my guys to use out in the field. It did not work on our Exterior panels nor on our Transformers the first, second or third time. The bits gave out and dulled as soon as they started drilling. We ended up purchasing high end step-bits we've ordered before and they worked well. I did a trial with these bits and ended up short on the winning end.

Drilling a 1 1/4" hole in a stainless steel sink? Any suggestions?

The best and cleanest option to punch a hole in a stainless sink is with a hydraulic Greenlee hole punch. They are expensive to own. You might want to see if you can rent a set.

What size is the shank

Hi Randy,The 3/16"-1/2"(six step drill) and the 1/8"-1/2"(thirteen step drill) both have 1/4" shank. The 1/4"-3/4"(nine step drill) has a 3/8" shank. Hope this will help you?

does this drill bit fits into the Black and Decker 3/8" 5-amp Variable Speed Drill with Keyless Chuck, DR260B

The shaft is 3/8 on the tool but, it is tapered so the drill chuck jaws can bite down so it will hold on to it, I have used it in my 3/8, 1/2 and my 1/2 mill, with no problem, I hope this helps you!

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🔧 Drill Your Way to Perfection!

DURABLE DESIGN - Crafted from high-speed alloy steel with a titanium nitride finish for long-lasting use.
PRECISION ENGINEERING - 135-degree split-point tip and 2-flute design for cleaner, faster drilling.
VERSATILE PERFORMANCE - Perfect for both wood and metal projects, ensuring you can tackle any task with ease.
UNIVERSAL COMPATIBILITY - Fits most pistol drills and drill presses, making it a must-have for any toolkit.
EFFORTLESS SIZE SELECTION - 10 clearly engraved sizes from 1/4" to 1 3/8" for quick and easy adjustments.

The NEIKO 10194A Titanium Step Drill Bit is a high-quality, versatile tool designed for both wood and metal projects. Made from durable high-speed alloy steel with a titanium nitride coating, it features 10 different sizes for easy adjustments and a precision-engineered design for cleaner drilling. Compatible with most power tools, this drill bit is perfect for professionals and DIY enthusiasts alike.

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Manufacturer	Ridgerock Tools Inc.
Part Number	10194A
Item model number	10194A
Size	Straight
Colour	Titanium
Style	Tri-Flat Shank
Finish	Titanium Nitride
Material	Titanium, High-Speed Alloy Steel
Pattern	1/4 to 1-3/8"
Item Package Quantity	1
Number of Pieces	1
Cutting Diameter	0.25 inches;1.375 Inches
Measurement System	Inch
Included Components	Titanium Step Drill Bit Set
Batteries included?	No
Batteries Required?	No
Assembled Diameter	0.25 inches;1.375 Inches
Item Weight	141 g

NEIKO 10194A Titanium Step Drill Bit, High-Speed Alloy-Steel Bit, Hole Expander for Wood and Metal, 10 Step Sizes from 1/4 Inch to 1 3/8 Inches

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