Description Light weight and ergonomic design - for comfortable, easy handling Constant Response(tm) circuitry ? provides soft-start, maintains constant speed under load, provides overload protection Variable speed dial ? provides the ability to adjust speed for specialty applications Lock-on/off switch ? for extended use applications Directed air flow - diverts dust away from vital components and extends tool?s life Service Minder(tm) brushes - eliminates guesswork, stops the tool when preventative maintenance is required Wrap around auxiliary handle - for multiple hand positions to provide maximum versatility and control Spindle lock ? for quick wheel changes