MID AMERICA MINI HAND GRINDER FOR POWER SUPPLY AND TRAVEL (5.5" LONG): Precision MINI hand grinder (5.5" Long x 1.5" Dia.) features adjustable chuck and 4mm banana plugs to use on most power supplies. 12 Volt, 16000 RPM. Small powerful size is perfect for your travel box. Leave your larger dremel at home and save space.