The DoohicKey QuicKey Tool is entitled a 4-in-1 Multi-Tool, and the description gives 5 aspects: "Includes a scoring point, bottle opener, file, serrated edge, and a #2 flat head screwdriver". Bottle opener - yes. #2 screwdriver - Well, Ok, but maybe hard to turn in-hand. File? Not so agressive; more like jimping (series of closely spaced grooves) on the backside of the key. Serrations? Had to use a diamond taper file to sharpen these serrations, especially the 'peaks' of the serrations, which are critical to 'biting in and ripping'... capability might only be string or grasses - paracord would be tough to cut. Scoring point? Really? Maybe that 5th aspect is not one of the official 4... you see the image of piercing a plastic blister pack? Not unless you sharpen the lower leading edge of the Key... but then it may cut a hole in your pocket if you sit on the keys in your pocket. The QuicKey Tool is unexpectedly heavy (compared to a typical key). They missed what might be its best aspect - this Key can also be used as a prying tool (instead of your pocket knife blade). So is it useful? If you sharpen the serrations, if you occasionally find a need to pry with this size item, if you just need to tighten a #2 size flat head screw (not start and drive it), if you do open bottles, then will be useful for you and will fit flat with your keys,