ANSWER :
210 in^3
EXPLANATION :
The toolbox is composed of 1680 cubes with sides of 1/2 in.
The volume of each cube is :
[tex]\begin{gathered} V=s^3 \\ V=(\frac{1}{2})^3 \\ V=\frac{1}{8} \end{gathered}[/tex]Multiply this by 1680 :
[tex]1680(\frac{1}{8})=210[/tex]