There is provided a spine assembly for a book cover or loose-leaf folder. The cover or folder comprises a channel shaped spine member (4) connected by way of a hinge portion to cover boards and an associated device, perhaps incorporating a compass (36), having securing means for securing the associated device (30) and the spine member (4). The spine member (4) has a base (10), side wall portions (11, 12) and a pin (20) by which the associated device (30) is secured to the spine member (4).