Wrench Screw Remover Watch Back Case Battery Cover Opener Repair Tool Set Kit for 32 mm or Smaller Watches Usually pay around much to get batteries changed in your watches? Now you can do the job yourself. The idea is a simple, and adjustable wrench type mechanism with two controls to move the three heads. Most of the tips are repeats of the main design, which is really all you need. Portable box set design, easy to carry 18 tips of 6 different sets Adjusts to fit the watch size under 32mm