If used with some common sense these are acceptable and serviceable. We're not dealing with high grade steel or exoticly finished metal. These are basic multipurpose allen head set screws and they fill that need. Over stress them and/or place them into corrosive environments and they are going to do what any similar product would. But if you're replacing a screw that holds that piece of plate glass in your entertainment center, or a missing set screw on a scope ring, maybe the set screw fell out or got lost for a locking component on a mechanical device you have - these are just the jobs the product can help to address.