Double sided V-Belts or also know as double angled V-Belt or Hex V-Belts are special desgined V-Belt designed for serperntine or reversing drives. Double sided V-Belts trasmit power from both sides of the belts. They come in three standard sections AA (1/2") BB (5/8") and CC (7/8") and in lenghts... Double sided V-Belts or also know as double angled V-Belt or Hex V-Belts are special desgined V-Belt designed for serperntine or reversing drives. Double sided V-Belts trasmit power from both sides of the belts. They come in three standard sections AA (1/2") BB (5/8") and CC (7/8") and in lenghts...