Watch Battery Replacement Tool Kit with Sizing Tool. Everything you need to remove the back from your quartz watch and change the battery yourself. Now you can replace your own watch battery without going to a jewelers with our Watch Works Tool Kit. This tool kit contains all the watch-makers secret tools used to open most watch case backs including screw-down backs, screw-on backs and snap-on case backs. Complete with watch band link pin removal pliers so that you can lay out any watch flat for easy accessibility and watch makers magnifying glasses to easily remove and replace the battery. The watch maker's screw driver has two sizes, small and large, just pull out the bit and reverse.