These premium black 3/8" Fellowes double loop wire binding spines are designed for use with the Fellowes Quasar Wire Binding Machine . Still, these 3/8" black elements are also compatible with virtually any other 3:1 pitch twin loop or double loop wire binding system. These black 3/8" spines allow you to quickly and easily create professionally bound reports and presentations. Both durable and elegant, these 3/8" black spines can hold approximately 50-80 pages. Get 25 3/8" black wire binding spines with every order. Product number 52541.