Precision Pentalobe Screwdriver Set, 0.8 mm, 1.2 mm, 1.5 mm (P2/TS1, P5/TS4, P6/TS5) for Apple iPhone, MacBook Pro, Air Retina
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This screw head clearly has one purpose: to keep you out. Otherwise, Apple would use it throughout each device. Instead, they only use it at the bulwark—on the outside case of your iPhone and MacBook Air, and protecting the battery on the Pro—so they can keep you out of your own hardware. I immediately noticed something odd about the Japanese phones: they had different screws on the bottom! These new screws looked like very small Torx (I guessed T3 at the time) but were actually something far more insidious. An Evil Ascending Galan, Walter (23 November 2009). "Installing MacBook Pro 15" Unibody 2.53 GHz Mid 2009 Battery". Repair Guide. ifixit.com . Retrieved January 28, 2012.
Although there is no (known) official standard naming scheme, the size is commonly known as P-sizes. TS-sizes are sometimes used, but leave room for mixing up with regular Torx sizes. The following P and TS sizes are used by iFixit.com, and PL sizes by Wiha, a German tool company: If you take your phone into Apple for any kind of service, they will sabotage it by replacing your screws with the new tamper-resistant screws.Pentalobe screw sizes include TS1 (0.8mm, used on every iPhone starting with the iPhone 4), TS4 (1.2mm, used on the MacBook Air and the MacBook Pro with Retina display), and TS5 (1.5mm, used on the 2009 MacBook Pro battery). The TS designation is ambiguous as it is also used for the Torq-set screw drive.
All iPhone 4S models contain identical pentalobe screws to those found on the iPhone 4. The iPhone 5 has very similar 0.8mm pentalobe screws, but the screws have longer 3.6mm shafts.  Non-Apple manufacturers [ edit ] MacBook Air 11" Late 2010 Teardown". Repair Guide. ifixit.com. October 10, 2011 . Retrieved January 28, 2012.When I was a kid, I begged my dad to let me help him with his weekend projects. I’d follow him around with a flashlight in one hand, his toolbox in the other. We sang Simon and Garfunkel’s “ Cecilia” in perfect harmony while we worked. Whenever he tasked me to shine my flashlight on something for further investigation, I felt like the chosen one. And when he’d ask me for a screwdriver, I’d reply: “ Phillips or flathead?”