My guess is because they are the ones that made the concept of turned down shanks with 3 flats to keep it from slipping popular. Just like a skillsaw.
 
Silver & Deming History

Silver & Deming evolved from the 1854 founding by Albert R. Silver and John Deming of a company to make agricultural machines. They made a variety of machines primarily aimed at wheelwrights but eventually moved into drilling machines. They came up with the large-size twist drill bit with a turned-down shaft that someone could use in a chuck smaller than the bit's cutting diameter; however, they did not patent the idea and it was soon copied by other companies. The term Silver & Deming drills continues to be used as a generic term for this type of drill bit.

From a search
 
Don't bother buy those from HF. Have had two sets and never drilled a hole with them. They dull as soon as you start to drill. Pure junk.
 
I looked at them and they didn?t feel like they would cut hot butter but they get Fairly decent reviews
 
Before you buy, read the fine print.

I bought a couple of 3/4" drill bits back in 2015. One was a Silver & Deming made by Irwin, and the other was a gold-oxide finish drill bit labeled "DWDCO Series Qualtech Cobalt Steel", but without a shred of cobalt in it! Was just a basic cheap drill bit that wouldn't cut through wood.

Another time I bought a numbered/lettered/decimal set, I think from HF (LONG time ago!). Most of the bits were ground wrong and the cutting edge couldn't make contact with what was being drilled. It was absolutely amazing to see right-hand drill bits with a slight left-hand grind. Some were more than just slight, too!

I'd stick with name-brand. If you want best quality, go to Grainger's website and buy the Made-in-USA bits.
 
AFAIK, the "Silver and Deming" company is LONG defunct, and their name is simply bastardized on large twist drills with a reduced shanks from "The Land of Almost Right".

Someone correct me if this is wrong, please.
 
I think they're too soft. I have two sets of them and they just won't cut. I tried step drilling and the edge that contacts the steel just dulls.

I use carbide hole saws when I can.
 

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