\begin{tikzpicture}
    \tikzstyle{point}=[circle,thick,draw=black,fill=black,inner sep=0pt,minimum width=4pt,minimum height=4pt]
    \node (a)[point] at (0.4,0) {};
    \node (b)[point] at (1,1) {};
    \node (c)[point] at (2,1) {};
    \node (d)[point] at (2.6,0) {};
    \node (e)[point] at (2,-1) {};
    \node (f)[point] at (1,-1) {};
    \draw (a.center) -- (b.center) -- (c.center) -- (d.center) -- (e.center) -- (f.center) -- cycle;
\end{tikzpicture}
