The C 18 is an 18 volt drill that is really 5 tools in 1 thanks to the FastFix chuck system: An optional eccentric chuck for corners and tight spaces, keyless chuck for bits up to ½'', Centrotec chuck for driver bits and quick change capabilities, right angle chuck for for those spots you never thought you'd get a screw or a hole and lastly the optional depth stop chuck. All these capabilities come packaged in the market's most reliable toughest framework featuring a brushless motor (efficient, reliable, reduced noise) and electronic micro processor protection featuring an electronic, rather than mechanical clutch, to extend the life expectancy of your tool.,The C 18 is an 18 volt drill that is really 5 tools in 1 thanks to the FastFix chuck system: An