He looks like a very talented artist for sure and a good Bladesmith. Looking at his work it seems that he usually uses O1 tool steel. He is calling his wrench forged knives a tool steel but who knows really. Maybe he did find some that were good quality and thus better steel but that is always a guessing game. Not to mention you have to be careful of the chrome plating many tools are coated with. This can be bad stuff.
If you are going to get into bladesmithing do some more reading and research. Start with simple cheap steel like 1084 which can be heat treated easily, forges easily compared to most tool steels. Oh and makes a great knife as well. Other ones for forging that I would recommend are aldo's 80crv2 which forges like 1084, maybe O1, W1 or W2. W1 can be found in several places.
Check out Aldo the steel baron. A 48" bar of 1084 I think goes for like $8 or something like that.