The flat surfaces or rings at the ends of cylinders on a printing press that come in contact with each other during printing which serve as a basis for determining packing thickness.
                                                            
                                                     
                        
                                                
                        
                        
                            in presses the flat surfaces or rings at the end of cylinders that come in contact with each other during printing and serve as a basis for determining packing thickness.
                                                            
                                                     
                        
                                                
                        
                        
                            In presses, the flat surfaces or rings at the ends of cylinders that comes in contact with each other during printing and serves as a basis for determining packing thickness.