\begin{center}
    \begin{tikzpicture}
        \draw[step = 0.5cm, gray, very thin] (-7.25, -1.25) grid (7.25, 0.25);

        \node[HE rect, /HE rect= straight] (A) at (-5.0, -0.5) {};
        \node[anchor = south] at (-5.0, 0.25) {\textbf{straight}};

        \node[HE rect, /HE rect= floating] (A) at (-1.5, -0.5) {};
        \node[anchor = south] at (-1.5, 0.25) {\textbf{floating}};

        \node[HE rect, /HE rect= u] (A) at (1.5, -0.5) {};
        \node[anchor = south] at (1.5, 0.25) {\textbf{u}};

        \node[HE rect, /HE rect= plate] (A) at (5.0, -0.5) {};
        \node[anchor = south] at (5.0, 0.25) {\textbf{plate}};
    \end{tikzpicture}
\\[0.25cm]
    \begin{tikzpicture}
        \draw[step = 0.5cm, gray, very thin] (-7.25, -1.25) grid (7.25, 0.25);

        \node[HE rect, /HE rect= coil] (A) at (-1.5, -0.5) {};
        \node[anchor = south] at (-1.5, 0.25) {\textbf{coil}};

        \node[HE rect, /HE rect= finned] (A) at (1.5, -0.5) {};
        \node[anchor = south] at (1.5, 0.25) {\textbf{finned}};
    \end{tikzpicture}
\end{center}