Which icons have matching width / height ? Material Design icons are uneven

If you look at the containing vector of Material Design Icons, this is what makes the icons match in size. However the vectors of the content inside are not all the same sizes and follow no standard, therefore the icons are jagged when they are lined up vertically or horizontally.

Here is an example of the containing vector:

Here is an example of the content box:

When placed side by side with other icons, the sizes of the content are all different sizes. It creates a design problem and is not pleasing to the eye.

Is there a solution for getting the content of Material Design Icons the same width / and or height? If not what other free icons solve this problem?