Precision Bench Drill Micro Holes Remove Broken Screw Watch Repair Tools Parts. Table drill chuck diameter 3.175mm It is recommended to use rotational speed drilling to ensure stable drilling and prevent the drill bit from breaking, High-precision watch repair bench drill, miniature bench drill, adaptable to 110-220V voltage. Using 3.175mm precision collet, XY axis cross slide, can be adjusted for differential adjustment, the error is only 0.01? . The slide travel 0-13mm, for watches and clocks of all kinds of small parts drilled accurately and not off position.