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A watch back case opener is a best case removal tool for repairing watches or changing batteries, maximum opening 34mm/55mm. You could adjust three pins according to the distance of the watch back case grooves and clamp three pins into the watch back case grooves, then rotate the removal tool, the watch back case will be removed.
Tips: How to Remove a Watch Back Cover with 3 Pins Watch Case Opener?
1. Measure the distance of diagonal grooves on the back cover, adjust watch case opener.2. Put right watch case opener pins into the adjustable watch case opener.3. Adjust the distance of two watch case opener pins and clamp the front two diagonal grooves on the back cover.4. Turn the handle to adjust another watch case opener pin and clamp the grooves under the back cover.5. Clamp this watch back cover and contra rotate it. Then the watch back cover can be opened.6. You could coat the back cover of the watch with watch silicone grease to increase waterproofing, clockwise rotate to install the watch back cover.