Micro Holes Precision Bench Drill Watchmaker Remove Broken Screw Watch Repair. 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. T is recommended to use rotational speed drilling to ensure stable drilling and prevent the drill bit from breaking. 1 x Precision Bench Drill.