Ultrasonic Multi Drilling Machine can drill holes on the multiple round beads in one go. It will take about 10mins to finish drilling on 55pcs 10mm round beads. (This drilling machine is only for round beads. The smaller the size the more quantity to drill). The size of round beads is 3mm-20mm, it can drill more than 19 to 211pcs (depending on the size of bead) a time. And the hole is 0.7mm- 2.0mm.
This Ultrasonic Drilling Machine is suitable for most of the semi-precious and precious gemstones The Ultrasonic drilling machine needs a mix of water and silicon carbide as a grinding medium.