This is a Roller-Lok 4 post expandable binder.  Binder locks automatically, and holds sheets firmly with positive compression.  It expands up to 50% over minimum capacity.  It was dealer used, and shows some signs of wear.

We stock multiple binders- if you need one in pristine condition, please email in advance to see if we have one in stock!  Most all of the binders we sell were used in dealerships and may have writing, shop stains, or other visual defect!