This Bessey WS-3 Angle Clamp has the ability to clamp different widths of material at 90 degrees while the user turns only one knob (the red handle).  I have used it while making drawers and it works!  I can clamp the  inch sides to the  front with no trouble and it allows me to clamp overlay fronts ( to  inch of the drawer front extends beyond the sides) and it holds the workpieces tightly.  No wiggle once this clamp is tightened up.