I wanted to replace the back glass on the iPhone 4 with this metal replacement that I had. I found a cheap pentalobe screw driver on one of those sites that sell cheap knock-offs. I removed the first screw but on the second screw the driver stripped to the point of uselessness. Side note, it made a good dart oddly enough.
ps- Shipping from said site took over a month; iFixit, 2 days with standard shipping to Virginia.
The kit was perfect, I took out the second screw, put the metal back on and used the new Philips head screws just in case. This way if I need to find a new driver, a 00 Philips is much less rare.
Buy the right tools the first time. iFixit is a great place to do so.