The K-Tek Case for the iPhone 4 and 4S is made from a solid piece of machined aluminum, and then anodized for a high quality finish. It features two 1/4x20 threaded holes for mounting your iPhone on a K-Tek Tadpole, tripod, or anything with a 1/4x20 threaded stud. Its unique design eliminates the need for tiny screws to hold it together, so you don't have to worry about losing small, vital parts to keep your aluminum case together, as well as eliminating the need to "assemble" your iPhone case. This new case works perfectly with any of the K-Tek Tadpoles, Norbert Sport, or Norbert Sport Junior. Please note: This case is finely machined to within one thousandth of an inch, therefore any screen protector that covers the entire front of the phone should be trimmed in order for the case to slide onto the phone properly.