Description Lock-on/off swtich ? for extended use applications Compact design - provides easy access to tight areas Constant Response(tm) circuitry ? provides soft-start, maintains constant speed under load, provides overload protection 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 Metal gear cover ? maximum durability