According to this click here the size is correct.
Download the file maxblast3.exe diskette creator to your Windows Desktop. Note: The maxblast3.exe file is too large for download to floppy diskettes.
To create the Bootable MaxBlast 3 Floppy Diskette:
After downloading, double click on the maxblast3.exe diskette creator icon.
Insert a new formatted floppy diskette into the A:\ drive.
When the program opens select Continue