Many of DEWALT’s small grinders (≈ 4.5′′ wheel) use a motor around 11 Amp AC/DC, delivering up to 11,000 rpm no-load speed — strong enough to “remove material fast” on metal, concrete, or masonry.
The compact motor + small wheel size yields a favorable power-to-size/weight ratio — meaning you get decent cutting/grinding force without lugging around a bulky tool.
The spindle accepts standard small-angle accessories (discs, cut-off wheels, brushes) thanks to a 5/8-11 (or M14, depending region) arbor — giving you a broad range of compatible wheels/wheel types.