15-piece screw-on case back opener set with 13 different sized dies, covering nearly all Rolex Oyster-style screw case backs.
⭐ At a glance
📏 13 dies from 18.50mm to 36.50mm
✅ Fits nearly all Oyster-style screw-on case backs
📦 Includes dies, adapter, turning handle (wrench) and sturdy plastic storage box
✔️ New with tags
Material: Aluminium and 316L stainless steel
🔧 What it does & how to use
This tool grips and unscrews threaded (screw-on) watch case backs, such as Rolex Oyster-style cases, without marking the case or crystal. It's designed for hobbyist and professional watch repairers who need to open a screw-on back to service the movement, change a battery or replace a gasket.
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Select the die: match one of the 13 dies to the diameter of the case back's grooves.
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Fit the die: seat the die onto the adapter, then position it centrally over the case back.
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Attach the handle: fit the turning handle (wrench) onto the adapter.
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Apply firm, even pressure: press down on the case back to keep the die engaged in the grooves.
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Turn to unscrew: rotate anticlockwise to loosen the back; reverse the process to close it back up.
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Store safely: keep all dies, the adapter and handle in the supplied plastic box when not in use.
⚠️ Please check the groove diameter of your specific case back against the die sizes (18.50mm–36.50mm) before use, as not every screw-back watch will be covered by these 13 sizes.
