Ring binders are a great product for holding looseleaf pages that need to open flat and/or be removed and replaced.  Common sizes are A4 and A3, but because we make everything in house the can be made to suit whatever size you would like!  We stock both 3 and 4 ring metals in sizes from 16mm capacity up to 65mm capacity.  If you need 1 for a portfolio or 500 to use as sales presenters, ring binders are a cost effective and efficient form of binding.