I needed a watch wrench ASAP to service waterproof watches for several clients. The tool works okay, but is of a very low quality. Be sure to press the bits firmly in place and you might want to use a needle-nose pliers to remove them when your task is complete. Also I would recommend that you obtain a pair of good quality Magnifying Glasses or Duel Glass Loops, and a Fluorescent Lamp to assist your tasks. Hey, you get what you pay for, a cheap tool at an affordable price. Soon I will be replacing this one with a high end Swiss made Watch Wrench. I'm satisfied with this one which will suffice until I get the other one.