The included black tool will help you complete your [installation no hassle], you can have a [perfect alignment] even without any installation experience.3d tempered glass features: Perfect fit: The protector using 3d curve fit technology can perfect fit your curved screen, providing maximum screen protection for your phone. We also provide a protector for back side, front and back protector can provide both sides protection for your phone. 9h hardness: Using electroplating technology to do glass hardening, it is up to 9h hardness, which improve wear resistance, corrosion resistance. Using physical processing to improve glass strength, protect phone screen from high drop or impact. Provide high protection for your phone screen. High-definition: Based on the best advanced technology, the transparency almost up to 99%, offers you a good viewing experience when you use it. High touchscreen accuracy: The 0.3mm thickness protector won't affect the touch sensitivity, you can enjoy high touching experience. Oleo phobic coating: The hydrophobic and oleo phobic coating surface protects screen against sweat and oil residue from fingerprints in daily usage, and makes the protector easy to clean. Easy installation: Easy to install and remove (please read our installation instruction carefully), bubble free when installation and no residue on screen when removed, easy to re-installation till the protector fit your phone screen perfectly, gives your device a high-quality look and feel. Please note: The product is made of tempered glass, it might be cracked under impact or force, but it can keep the screen away from scratches and save your cell phone in some occasion, please be gentle while installation and in daily usage.