The present application is directed to devices and methods for spacing vertebral members. The devices may include a body with major and minor axes. A first pair of opposing sides may be disposed along the minor axis and a second pair of opposing sides may be disposed along the major axis. The device may be rotated from a first orientation with the first pair of opposing sides facing towards the spinous processes to a second orientation with the second pair of opposing sides in contact with and spacing apart the spinous processes. Methods may include inserting a body within an interspinous space between the first and second spinous processes. The body may be inserted in a first orientation with a major axis of the body being aligned with a centerline of the space. After insertion, the body is rotated to a second orientation with the major axis being aligned across the centerline of the space and contacting opposing ends of the body against inner edges of the spinous processes and spacing apart the spinous processes.