Precision Watch Repair Tool AC 110-220V Micro Bench Drill Mini Drilling Machine With Speed Adjustable Power Adapter, Table drill chuck diameter 3.175, Can hold 0.2/0.3/0.35/0.4/0.45/0.5/0.55/0.6/0.65/0.75/0.75/0.8/0.85/0.9mm, Height is 22cm, I. T is recommended to use rotational speed drilling to ensure stable drilling and prevent the drill bit from breaking.