These premium black 9/16" Fellowes double loop wire binding spines are designed for use with the Fellowes Quasar Wire Binding Machine . Still, these 9/16" black elements are also compatible with virtually any other 3:1 pitch twin loop or double loop wire binding system. These black 9/16" spines allow you to quickly and easily create professionally bound reports and presentations. Both durable and elegant, these 9/16" black spines can hold approximately 100-130 pages. Get 25 9/16" black wire binding spines with every order. Product number 5255601.