I've had an SAE (yellow) Bondhus hex set for a while now (I got them on 80/20 hardware builds) and I really need a metric set to go with it. I chose this one because it's a 10 piece set (as opposed to the more common 9 piece set). I love these ball end kits. This is very useful when you need to work from a small angle. They are surprisingly good quality for the price and should last you a lifetime if you don't overuse them.