A straight die grinder can also be called a standard die grinder. It gets its name because the grinder comes straight out of the handle. This design is excellent for the user to have more control over the grinding that they'll be doing...
The die grinder rotates at very high speed, and is used to remove material from a workpiece or surface. It is perfect for machining small areas for which a regular one-handed angle grinder is too large.
A die grinder is a handheld power tool for grinding, sanding, honing, and polishing various materials. It typically has an abrasive disc or wheel mounted on the end of a rotating spindle. Die grinders typically use high-speed rotary files or burrs to remove material from a workpiece, giving it a smooth finish.