Double Loop Binding

Double loop binding is the process of using a series of double wire loops from a continuous pre-formed wire. The loops of wire are held open by a machine to allow the pages to be inserted over the loops. Double loop wire binding is more expensive than plastic combs or spiral binding but it's worth it in the long run because double loops are more durable and professional. Below are the standard sizes of wire typically used for double loop binding.

3:1 Wire:

With this wire, the paper is punched 3 holes per inch, which is 32 holes per standard 11" sheet size. It is available in sizes ranging from 3/16" up to 9/16" in diameter. It has the best appearance of all double loop wire.

2:1 Wire:

Pages are punched with 2 holes per inch or 21 holes per standard 11" sheet size. 2:1 wire is used for binding books that are too large for 3:1 wire and is available in sizes ranging from 5/8" to 1". The wire is more durable and sturdy than 3:1 wire.

19 Loop:

The pages are punched with 19 rectangular holes per standard 11" sheet size and the wire comes in diameters ranging from 1/4" to 1". The wire is similar in appearance to 2:1 wire.