DEWALT 1/4 In. height performance fast cutting and grinding wheels have high performance aluminum oxide grain for long life and high material removal speeds. They have a high grain concentration for an aggressive grinding action and smoother running wheels. They also have 3 full sheets of fiberglass for durability and user safety. These wheels are ideal for heavy-duty cutting and grinding of ferrous metal (steel, iron welds, edges, etc..), weld blending and edge grinding, or pipe beveling and root grinding.