, used in manuals) Angle D ring (ring mounted on back cover, used in manuals) Post Rings (used in catalogs) Multi ring (used in menu covers) The following is a guideline for art...Technical Information Ring mechanisms come in several formats and sizes, all with a different use and function: Round ring (used in manuals) Straight D ring (mounted on back cover.... Register marks are required, sizes for covers are provided in the insert chart. There are some ink limitations, light ink colors will not cover dark colors or dark vinyl's. Screens...