Now let me  introduce our Kaifull motor for your evaluate :our best advantage is step motor, our raw material and equipments are all imported form Japan , and we have a professional quality control group. so our  reject ratio can reach 6PPM . this should be the best class in the electromachanical trade.So we are very confident of our quality . You may know that there are many grade of step motor , we could assure you that ours is grade 1 , For the quality , I&＃039;ve said to you it&＃039;s grade 1 , which you could see from the spec. , For the service , we also could guarantee you we&＃039;re grade 1 , we have our own engineers , who could solve your problems whenever you may meet.We have factory to guarantee the quality , the delivery time ; we have the engineers to guarantee service , I guarantee to be on your service all the time ! You could buy a sample for testing at first , after your total order up to 1000pcs , we could reback the cost of it and the shipping cost of it to you !