... ; 3. 3. iron sheeting is easily rusted. Meanwhile, manually punching is slow, laborious, unefficient and low quality.Brightness automatic grommet ... and voltage in different countries and areas.semo-automatic punching mahcine,used 8,10,12mm eyelet,with safe sentor ... protection and energy saving .It adopts electromagnetic force directly punching and finish the task. It only uses electricity in ...