The standard twin loop wire spines that we carry here at MyBinding have either 32 loops for 3:1 pitch or 21 loops for 2:1 pitch. However, we have many customers who need special lengths for their projects. Whether you need shorter lengths for use with calendar hangers, half size, legal size or 11x17 lengths we have them all. Simply choose the color, pitch and number of rings that you need. The best way to know how many loops you will need is to punch a sample document and count the holes. Just make sure to choose the right pitch (3:1 has 3 holes per inch and 2:1 has 2 holes per inch). Order your custom length wire online or give our customer service agents a call and they will be glad to assist you.