When we need to know something about the geometrical parameters of the metal sites, the MDB has tools for that too. For example, we can request the distribution of the *Zn-His(ND)* distance when zinc has a *coordination number of 4* using the appropriate form: The MDB server will generate the histogram, display the statistics for the data, and list the bins with a button that allows the display in the java viewer of the sites containing the particular metal-ligand distance range.