Your kidding, right?
Being a carpenter by trade, I've used these (we call them sure lock or square lock head) screws for over three decades in Florida.
Commonly come in a #1, 2, or 3 head. Also come in "finish" screws with a tiny, #1 head for trim.
The preferred head.
The bits for these screws come in ALL bit assortments I've ever seen.
Are you referring to some OTHER feature of the screw?
