Short section O-size: the length of count screws: Length 42-44CM width 35.5CM

               : ID width: 21.5CM diameter length: 24CM screw hole pitch: 14-17CM

Long section V-size: the length of count screws: Length: 46-48CM Width: 35.5CM

                  : Inside diameter: 21.5CM Inside length: 27CM Screw hole distance: 14-17CM

Large U size: the length of count screws: Length: 46-48CM Width: 35CM

           : Inside diameter Width: 20CM Inside width: 26CM Screw hole distance: 16.5-19.5CM