A7 Vertical Binder Hardware (Backless Type) 5 Holes [F120-5-15R - 15SR] 1 Piece Binder Hardware is divided into large and backless type (requires fasteners and fasteners) The binder hardware that starts with the product name symbol "F", has a hole in the main body and is secured with a stud metal (sold separately). Use clamps or hollow rivets or single-screw screw screws to fasten Please check the size of the installation refills (paper) carefully before purchasing. Mounting binder fittings: The backless binder hardware is installed on the spine and main unit with either a clamps or a single-screw screwed screw. If you do not attempt to install it once you fail to use it with a clamp or tack, it is difficult to remove it and use it again and again. If you dont want to remove it, you can use clamps or tacks. The thickness of the main unit is about 0.3 inches (7 mm), so if you are looking for a corkscrew, we recommend that you use both sides of the foot length or the extra feet length on both sides. For screws, 1.6 x 0.3 inch (4 x 7 mm) screws are best if you want to use a thick one on the cover. Measurements are approximate. The color of the actual product and the color of the posted picture may differ depending on your monitor.