The G-Line by Gorvex 3-Ring Binder Rack 3004, 3005 is a durable binder holder that can comfortably accommodate up to 4" ring safety data sheet binders. It is a sturdy wall mounted rack that is ideal for mounting and storing log books and other essential ring bound items in a central and convenient location. Yes, the rack is completely collapsible for easy storage when not in use. This product is available in a choice of yellow or white. Screws are included for easy installation.