What’s pentalobe screwdriver?
The pentalobe screw drive is a five-pointed tamper-resistant system primarily used by Apple in its products.The screw is officially called the "Pentalobular security screw" by Apple. Pentalobe screws have been used by Apple since 2009, when they were first implemented in the 15-inch MacBook Pro. They have since been used on other MacBook Pro, MacBook Air and iPhone models. Apple attracted criticism upon the introduction of the pentalobe screw; it was seen as an attempt to lock individuals out of their devices.
Pentalobe screw sizes include TS1 (0.8 mm, used on the iPhone 4, the iPhone 4S, the iPhone 5, the iPhone 5c, the iPhone 5s, the iPhone 6 and the iPhone 6 Plus), TS4 (1.2 mm, used on the MacBook Air and the MacBook Pro with Retina display), and TS5 (1.5 mm, used on the 2009 MacBook Pro battery). The TS designation is ambiguous as it is also used for the Torq-set screw drive.