Split&Concat : Split and Combine in a Single Click

Split & Concat is an application for your Mac than enables you to split you big file and then you can combine them easily with just a single click.
This application can split your file into several split file with a .0** extension behind them with ** for the number of your split files. How large each file is can be set at the start of the spliting process.
to combine these fles, you only have to selcet 1 files ann then let Split & Concat do the rest of the works for you.
For more info go to this link.