I have no idea what that could mean.
You could try BoxEdit.
This topic comes up once in a while - I can recommend searching on this group and reading some of the discussions.
These are just a few of them:
http://discourse.mcneel.com/t/resize-object-to-specific-size-what-are-object-dimensions/
http://discourse.mcneel.com/t/object-dimensions/
http://discourse.mcneel.com/t/how-to-design-with-dimension-in-rhino/
http://discourse.mcneel.com/t/newbie-property-sizing-enquiry-simple-box-dimensions/