 Center to Center Definitions Center to Center: When ordering a Handle Set, the "Center-to-Center" measurement is definitely something that should be taken into consideration. The Center to Center is the measurement from the center of one bore hole to the center of the other bore hole in any standard door. The most common Center to Center measurement is 5-1/2"; however, 3-5/8" and 8" Center to Center measurements are also fairly common. | 
