... -all reduction ratio:1 stage reduction: 1/3.7 , 1/5.2 2 stages reduction: 1/13.7 , 1/19.2 ... .93 stages reduction: 1/50.9 , 1/71.2 ,1/99.5 , 1/1394 stages reduction: 1/188 , 1/264 ,1/369 ... ,1/516 ,1/721 5 stages reduction: 1/699 ,1/977 ,1/1367 ,1/1911 ... /2672 ,1/3736 One of all models: PG45-99.5K reduction ratio: 1/99.5Numbers of stage:3efficiency :73%(3stages)Appearance size ...