3 Watch Case Openers Wrench Hand Watchmakers Hand Tools. Case Opener. This is a new butterfly watch case back removing tool. It has an adjustable metal pin for use on many sorts of watch case backs, such as those from Accutron. The compact size of this tool makes it very convenient to keep around. It measures approximately 2 1/2" x 2". Watch Case Wrench. This is a new watch case wrench. The adjustable tempered pins are for use on water resistant cases. It provides a tight non-slip grip. It has long handles for increased pressure. It includes a double blade. This is a replacement for the Jaxa wrench. Tips adjust from 9/16" to 1 9/16" (15 mm to 40 mm) 2 Prong Waterproof Watch Case Wrench. This is a new waterproof watch case wrench. It has adjustable tempered pins for easy use on water resistant cases. Its compact size makes it very convenient. This is a replacement for the Jaxa wrench. Tips adjust from 7/16" to 2 1/8" (11 mm to 54 mm). We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.