Oyster-style case back wrench with six interchangeable dies (18.50mm–29.5mm) for opening screw-down case backs on Rolex and Tudor watches.
⭐ At a glance
📏 Six die sizes: 18.50mm, 20.20mm, 22.50mm, 26.50mm, 28.3mm, 29.5mm
✅ Fits screw-on Oyster case backs, Rolex and Tudor
📦 Wrench body plus full set of interchangeable dies
✔️ New with tags
🔧 What it does & how to use
This tool grips and turns screw-down case backs to remove them for battery changes, movement servicing or case cleaning, then re-seals them afterwards. It's designed for watchmakers and hobbyists working on Rolex and Tudor Oyster-case watches, and comes with a range of dies so it can be set up for different case back sizes.
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Measure: check the notch or groove pattern on the case back and measure its diameter.
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Select the die: fit the matching die (18.50mm, 20.20mm, 22.50mm, 26.50mm, 28.3mm or 29.5mm) into the wrench body.
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Locate the die: seat the die's teeth or pegs into the case back's slots or notches.
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Turn to open: hold the watch steady and rotate the wrench anticlockwise to unscrew the back.
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Turn to close: once work is complete, rotate clockwise to re-seat and tighten the case back securely.
⚠️ Please check the case back's notch pattern and diameter against the die sizes supplied before ordering — the wrong die won't grip the notches correctly and could slip or mark the case.
