Loop stitching is a form of binding where the stitches (staples) form a loop that can be used to hold the book in a binder. Loop stitching is basically the same method of binding as saddle stitching, however a special stitching head is used that produces a loop in the outside portion of the stitch.  With this type of binding books can be put into binders without the need of drilling. 

Sizes can be from 60 x 60mm up to A3 portrait. Pages are from 4pp minimum up to 52pp maximum.