I purchased this to carry in my vehicle in the event I needed to make repairs on the go. I was really pleasantly surprised when they arrived as they look and feel like substantial wrenches. The price was my main criteria when purchasing, and this set was both inexpensive and contained both Metric and SAE wrenches with a wide selection of both. I've ended up using the wrenches 8-10 times since receiving and they fit as they are supposed to and have performed just fine. I'm not sure how they'd hold up to heavy daily use, but that wasn't my objective. The only down side I could find was 1) The roll up bag is a little flimsy and you need to be certain that the flap is over the wrench heads or they can easily fall out when rolled up and 2) The string to tie up the roll tore off after the 2nd use. It's not a bit deal though as I ended up just putting a bungy cord tie around it. I'd definitely recommend these for a spare / emergency set in the car, and for occasional use just about anywhere.