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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规格

Material	Titanium
Finish Type	Titanium
Cutting Angle String	135 Degrees
Item dimensions L x W x H	15.5 x 7.4 x 4.1 Centimeters
Tool Flute Type	Spiral
Surface Recommendation	Titanium
UPC	799198591307 735090625498 837013101949 753956688876 844699046549
Net Quantity	1.0 Count
Global Trade Identification Number	00837013101949
Manufacturer	titanium
Number of Pieces	1
Country of Origin	USA
Model number	10194A
Item Weight	141 g
Product Dimensions	15.49 x 7.37 x 4.06 cm; 140.61 g
Item model number	10194A
Item Height	1.6 Inches
Item Width	2.9 Inches
Are batteries included?	No