You will need only two AA size batteries to operate this extremely comfortable Bead Reamer. In Set included 3 interchangeable tips to drill very small and large holes. The smallest hole you can drill about 1mm diameter and the biggest about 6mm diameter. Surface of drilling tips very similar to sanding tips but mach stronger. Size of Bead Reamer measures 13cm long x 3.5cm wide and very comfortably fit into the hand.
Note, since the tips are sharp, this tool not suitable for children.