What is the difference between Amcon's three hand tool lines?

Standard Line tools feature blue comfort grip handles, box joints, and stainless steel construction. One year warranty.
Ergonomic Line tools feature non-slip cushion handle, precision calibrated spring action jaws, and stainless steel box joint construction. One year warranty.
Premium Line tools are our highest quality. Feature smooth satin finish and stainless steel box joint construction for precise control. Three year warranty.