What is the difference between shelving starters and adders?

What is the difference between shelving starters and adders?

Hello, I am John with A Plus Warehouse and I am here to answer your questions.

 A starter unit is a complete unit that can stand alone. If you have a run shelving you gotta start with a starter

  The adders are as they sound, additions to your original shelf

 So if you want a 5 wide shelving unit you must order one starter and 4 adders to join it

 Be sure to ask any other questions you have in the comments below.