D2 is a good tool steel. It is a carbon steel so it will rust (like 1095, et.al.) and heat treatment is important to get the most out of it. It’s good for general purpose and sharpens well and takes a very fine edge. I personally like good carbon steels like 1095, D2, O1 (Cold Steels Carbon V is great), and the crucible steels like CPM154 for that reason. Some of the newer steels like VG10, S30V hold an edge, take a beating, and are corrosion resistant, but wear out up my stones so I went to diamond for those. I mainly do cutlery, but some pocket knives.