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!

Manufacturer	Neiko
Part number	10197A
Item Weight	518 g
Product Dimensions	20.19 x 11.99 x 4 cm; 518 g
Item model number	10197A
Size	5 Pc Step Bits, SAE
Style	Standard/SAE
Finish	Titanium
Material	Tri-Flat Shank
Pattern	Punch
Item Package Quantity	1
Number Of Pieces	5
Number of Handles	1
Measurement System	Inch
Included components	Titanium Step Drill Bit Set
Batteries Included?	No
Batteries Required?	No

NEIKO 10197A Step Drill Bit Set, 5 Pc Step Bit for Metal, 50 SAE Sizes Total, 1/8” – 1-3/8”, SAE Titanium High Speed Steel Unibit, Stepper Cone Drill Bit, Two Flute Step Down Bits, Step Up Drill Bits

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