Ring Size - Measuring
The most common mistake people make in determining ring capacity is using an existing binder and measuring the outside spine width. For O rings, you should always measure the inside diameter of the ring. The spine width method will always end up in a larger binder size and a disgruntled customer. D ring and Angled D rings aren't as easy. Call us for help or send us an E-Mail. We'll send you a free ring gauge if all else fails.
If you don't have a binder, but know how much material will go into it, use the following method: 100 sheets (20# Bond or 50# Offset paper) for each 1/2" of ring capacity.
For example, if you will be putting 400 sheets and tabs into the binder, just divide by 2 (= 200) then by 100 (= 2) and you would use a 2" binder. D ring and Angle D ring binders hold more, but not enough to change this method. Don't forget about the user putting additional material in at a later date.
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