For watch enthusiasts who want to change their own batteries or inspect movements, the Two-Claw Watch Rear Cover Opening Tool provides a secure, non-slip grip. Stop worrying about scratching your case back with improvised tools and start performing maintenance with professional precision from your own home workshop.
Tool Type: Adjustable case back wrench
Adjustment Range: 15mm to 50mm
Material: Hardened carbon steel
Application: Screw-down waterproof case backs
Why Choose This
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Adjustable Span — Fits case back notches from 15mm up to 50mm diameters.
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Hardened Steel Teeth — Grips case notches firmly to prevent slipping and scratches.
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Knurled Handle — Provides a textured surface for better torque and grip control.
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Compact Design — Slides easily into any standard watch repair kit or drawer.
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DIY Maintenance — Allows for quick battery swaps without paying jeweler service fees.
Materials & Build
This tool is machined from hardened carbon steel to resist bending or warping under pressure. The central screw mechanism uses a fine-thread pitch for precise millimeter adjustments. The two claws are specifically shaped to fit the standard rectangular or square notches found on most screw-down waterproof watch cases. The matte finish helps resist fingerprints and provides a clean, professional aesthetic for your workbench.
Compatible With
Show all compatible models
- Seiko Diver series (SKX, Turtle, Samurai)
- Citizen Promaster and Eco-Drive screw-back models
- Vintage Omega Seamaster and Speedmaster cases
- Casio Duro and MDV series
- Most modern quartz watches with notched screw-down backs
- Standard 38mm to 45mm dive watches
- Note: Not compatible with snap-on or friction-fit case backs
Sizing & Fit
The Two-Claw Watch Rear Cover Opening Tool measures 70mm in total length and 28mm in width. The adjustable thumbwheel allows the claws to move between a minimum width of 15mm and a maximum width of 50mm. This range covers approximately 95 percent of all notched screw-down watch cases on the market today. The lightweight 40 gram construction ensures you can feel the resistance of the case back without the tool feeling bottom-heavy.
Ships from Berlin within 24 hours. Typical US delivery: 5-8 business days.
FAQ
Will this tool scratch my watch case back?
Scratches usually happen when a tool slips. This tool uses hardened steel claws and a screw-locking mechanism to stay firmly in the notches. For extra protection, you can place a thin piece of plastic wrap or masking tape over the case back before applying the tool to ensure a metal-on-metal contact doesn't leave marks.
How do I know if my watch has a screw-down back?
Look for small rectangular or square indentations around the edge of the metal circle on the back of your watch. If you see these notches, you need a tool like this to unscrew it. If the back is completely smooth with a small lip on one side, it is likely a snap-on back and requires a different pry tool.
Does this tool work for Rolex or Tudor watches?
Rolex and Tudor typically use a proprietary "coin-edge" or fluted case back rather than standard notches. While this tool works for most universal notched cases, it is not recommended for the specific fluted designs of Rolex Oyster cases which require a specialized multi-point ring tool for the best fit.
How much pressure should I apply when opening a watch?
Apply firm downward pressure while slowly turning the tool counter-clockwise. The downward force is what keeps the claws seated in the notches. Once the initial seal breaks, the back should unscrew easily. Always ensure the claws are adjusted to the exact center of the notches before you begin to turn the handle.
Once you have opened your case and completed your maintenance, check out our watch band replacement guide to refresh your watch's look. If you need to swap parts on your strap, our tutorial on how to replace a watch buckle provides step-by-step instructions for a perfect fit.
Ships from Berlin · 30-day returns · 1-year warranty · USD pricing, duties prepaid for US orders.
