Modern Shelving brackets are strong, stylish and infinitely adjustable.  You may place them at any location along the vertical channel of the Modern Shelving WAL standards.   Slide the bracket up and down at a 45 degree angle and then lock into place at a 90 degree angle without the need for tools.    

The brackets also work well as bookends due to the lateral stiffness.  Therefore, they are referred to as Bookend Brackets.  The typical design will use one bracket size shorter than the shelf bracket.  For example, a 12' shelf will use 10" bookend brackets as bookends. 

The WITH PIN option has a PIN on top shelf face which fits under aluminum shelf cuttaway to secure shelves in place but is not necessary depending on use and application.  Some customers place a small hole in their wood shelves at the pin location also.