These are quality impact sockets, with a full collection of metric and SAE sockets, along with a heavy duty 3/8" wrench, size adapters, and extensions.
I have a set of my own and they have been invaluable in repairing my 2000 Range Rover, I have used them with my Dewalt impact drill to loosen some very tight bolts. I am firm on the price. When you see the quality you will agree, You could spend 100's for a set like this.