Hello friend, 
 
       Here is Simon from Bizbee , wish this mail finds you well :) 
       From iPhone 8G and above models , all with back glass cover , do you face many customers look for repair the back glass and you take much time to change a back glass ?  
       As you know , the salary very high for your technicians , if you don't have an useful tool , waste much time and much money . 
        
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