One factor to consider is whether or not the document that you need to bind is already GBC punched.  If it is, then just select a comb that is the appropriate length.

If it is not already punched then you must ask yourself - "Self - I have a legal size 14 x 8.5 document and I can obtain legal size covers and GBC combs from Indoff but can I punch this document?".

Many medium duty GBC style punch binding covers have an 11" length capacity (if you are not sure, count the punch pins/teeth). If there are 19, then it is one of these and will work for binding letter size documents on either edge or smaller.  Some machines have a 12" length capacity and will accomodate the A-4 size 11.69" length as well.

Your better quality commercial grade office punch/bind (combo) machines, like the one we distribute, and punch only equipment will usually handle document lengths up to 14", legal size.

If you have a document that you wish to bind over 14" in length, it is best to have the commercial printer that produces the document also prepunch it for binding.  We would provide you or the printer with the binding combs necessary to finish the document.