This is an interesting concept, but the square drive is not compatible with most of the door hardware made for th US in the past 35 years. Go to Home Depot or Lowe's and see for yourself. Neither the cheap stuff not the good hardware uses that system any more. There is some institutional harware that still uses the square drive, but that package shown would wear out in less thanm a week, unless the plastic is much more durable than the PE, which is what it looks like.
So it will be very interesting to see if there is any succes in this product and concept.
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