Review on 🔪 Spifflyer Self Retracting Utility Knife Box Cutter: 10pc SK5 Blades, Full Metal Shell, Lightweight Design by Nick Kussmaul

You would be hard pressed to find a self retracting knife for this price with extra blades included.The outer shell is plastic, but i regularly drop mine on to a concrete floor as I work, and it has not shown any cracks, or damage. The blades seem to hold up fairly well, and last quite a long time (I think I've had to change mine 2 times in a month of constant use).The downside comes when switching the blades. You have to unscrew the case, and the way the spring is mounted in the inside, you have to be very careful when replacing your blade or the knife will stop self retracting. My first blade swap I spent quite a bit of time trying to get the knife to work properly again. I eventually reopened the case and noticed the spring was getting caught on a piece of plastic on the inside. Not a big issue once you are used to it.If you're purchasing the knife for safety reasons, one thing to be careful of is the switch to pull the blade out. Most safety blades have the switches depressed, but this one does not, and the switch is mounted on the back of the knife. I actually prefer this because it makes using the knife easier and safer when actually cutting. The problem is that if you store the knife in a tight pocket, the blade will push up because the switch is not depressed. Again not a big issue once you are used to it.If you only use knives every once in awhile in your home you may want to consider a cheaper option. If you use knives regularly for a job, hobbies, etc this knife will work very well, and is a step above the cheap knives you would find in a regular store's aisles. If the issues I stated above are a deal breaker, I would recommend a more expensive knife.As it stands this knife is a good value with only a few issues making it not 100% perfect.