These sinks are high quality series with thickness 0.6-1.2mm, Material can be SUS201 or SUS304.
Corner Radius is big corner R75-R80.
An under mount sink fits flush to the counter and is supported only by brackets on the underside of the counter. 
The countertop must be cut out very precisely to make the sink fit. 
The countertop must be one solid piece, not made of laminate. 
Water can get into the layers of laminate where the sink meets the countertop.