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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It is possible that ambiguous "TS" nomenclature is the same as the "PL" designation when referring to Pentalobe screws.
Of course, we didn’t have the right screwdriver, but with some finagling, we managed to extract the little screws. This was the only internal usage of pentalobe screws; all following MacBook Pros use the "Tri-Wing" security bit to attach the battery to the internal frame, or else have glued-in batteries. The late-2012 version of the 13-inch MacBook Pro was the first 13-inch model to have pentalobe screws; several were used externally in a similar fashion to the 15-inch mid-2012 MacBook Pro.
Apple would never use a real Torx security screw with a post for two reasons: they’re ugly, and the posts break off easily with screw heads this small. Pentalobe screws were adopted by Apple starting in 2009, when they were first implemented in the 15-inch MacBook Pro.
This Plentoy Pentalobe Screwdriver Set includes 3x screwdrivers and 3x plastic spudgers to help you with your iPhone and MacBook repairs.The real solution is to get rid of these pesky screws so you can use a normal Phillips screwdriver on them. The last five versions of the 13-inch MacBook Air (late-2010, mid-2011, mid-2012, mid-2013 and early-2014) use eight 2.