Pin Trapano a Mano e Mini Trapano a Torsione Set 40 Pezzi Micro Trapano Set per Gioielli
When punch for the harder objects, make a hole with a small dril firstly, then expanded it to a larger hole. The shape of the drill shank: round only. High-precision, double-chuck, it can clip the drill of 0.2~2.0mm.