I'm using these for 3" and 3-3/4" cabinet doors and drawers in my kitchen, linen closet and bathroom vanities.  When used for the 3-3/4", the bar holders are at the end of the bar and are a little more difficult to install for correct bar placement.  So they will not have the same spacing as the 3" on the doors.  But I'm thrilled I'll have all matching handles!!