No these are engineered for light weight.
Less than 0.5 inches
At the very top of the leg, about an inch and a half. At the bottom, the metal leg cap measures about 1/2" to 3/4"...it is a pleasant scale...
I believe they can. And I think they sell that plate. I was able to twist mine around a bit and achieve a slight angle.
I just drilled small pilot holes for the small wood (pointy) screws that came with the mounting plate...worked great . So, drill small hole (smaller that the screw) and then manually screw tight!!!
If the Karlstad leg is the same as the Besta Leg, then yes! I just screwed 4 of these into one of my Besta cabinets. Thrilled!
The leg attaches to a PLATE and then the PLATE attaches to the table. You cannot just screw the leg into the table...they really ought to just sell the mounting plate with the leg, all in one package....