Adjustable Split Ring with Hex Fitting. This device is the Mini-Bookler® Version of our popular Eagle Split Ring System for adult abdominal surgery. Designed for Pediatrics or small incision adult procedures it has a 7″ (17.8cm) Diameter in the closed position. It has its own built-in hexagonal fitting and attaches directly to any Mediflex Holder and Positioner with a Quick Disconnect Feature. All Mini-Bookler Rings and Segments feature notches for use with disposable hook retractors.