The Karas Kustoms case for the iPhone 4 is a CNC machines aluminum case with a very industrial look and feel. It's not everyday you see someone using an iPhone with this kind of case that's for sure, it might even give you some street cred. This case has two parts two it and uses four screws on both sides to secure the case on the iPhone 4 using a small hex key. Karas Kustoms includes two extra screws in case you lose a few as well as the hex key. The Karas aluminum case isn't really a case but more of a frame for your iPhone 4, it coveres the front and back edges all around while leaving the metal band of the iPhone 4 completely opened.