Firstly, when buying this product one should be aware that it only cuts a mini-Sim card into a Nano-sim card (for iPhone 5). If you want to cut a mini-Sim card into a micro-Sim card (for iPhone 4/4s) I advise you to search for a different product! Secondly, I could see when inspecting the product that it wouldn't give a clean-cut finish, I half-expected it to just bend the sim around the edges... I wasn't completely wrong. Unlike a paper hole-punch which uses a sharp hollow cylinder to cut through paper, the Digiflex cutter uses a solid sim-shaped block to push out a nano-sim card shape from a mini-sim card. The cutter didn't properly cut the sim card. It seemed to just snap the gold bit off at one end leaving jagged edges and then it didn't cut the rest off leaving it bent at the other end, forcing me to use scissors to cut the rest of it off. If i had continued to use the cutter to trim it the gold bit would have surely been damaged. The "cut" sim was left jammed inside the cutter and I had to very carefully try and remove it so i wouldn't scratch the gold part of the sim. After successfully removing the sim carefully from the metal trap, the cutter was left dislocated from its joint, proving just how flimsy this product is. Just to prove how even more un-fulfilling the product is, i attempted to use it to see whether it would cut paper and card and it didn't even do that! I would have given this product one star but it came with everything displayed in the description including an adapter so i could fit it into the phone (after a lot of fiddling) and luckily the sim card still works. I would NOT recommend this product! If you have a steady hand i would advise you to use scissors rather than this sim-destroyer.