Pack contents
1 handheld driver and 13 dies
KZU · Rotating case-back tool
KZU WBR647 13-Die Case-Back Opening Kit
A handheld driver with thirteen grooved dies for matching screw-back engagement profiles.
Confirm the exact back profile as well as its diameter before choosing a die.
$58.42Nov 6, 26, 08:03 PM · New York
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- Advertised die labels 18.5,20.2,22.5,26.5,28.3,29.5,30.5,31.5,32.5,33.5,34.5,35.5,36.5 mm
- Material claim Alloy steel
- Retail model/part WBR647
The physical equipment
Construction & package details
What this choice changes
Match a grooved die to the actual back profile
For a screw-back with a matching grooved perimeter, this WBR647 kit combines a handheld turning driver with thirteen interchangeable dies. Each selected die uses a circular grooved contact, unlike the separate claws of a three-point wrench or the silicone friction contacts of an opener cup. Choose this format when the actual case-back profile calls for a matching grooved die.
The listed die labels are 18.5, 20.2, 22.5, 26.5, 28.3, 29.5, 30.5, 31.5, 32.5, 33.5, 34.5, 35.5 and 36.5 mm. Diameter is only part of the match: the groove profile and how the die meets the case back still matter. These labels do not establish compatibility with every watch from the brands named by the seller.
The offered kit is listed as KZU WBR647, while the pictured removable dies carry HUAXING markings. Their manufacturer relationship and cross-brand interchangeability are not documented. If you need a replacement die for an existing system, verify the actual receiver rather than relying on the seller’s inconsistent 5537 and 5337 labels. Compare the MEKOTRIN bench system if a supported frame and case holder are also part of the purchase.
Specifications & supplied details
| Detail | Listed specification |
|---|---|
| Advertised die labels | 18.5,20.2,22.5,26.5,28.3,29.5,30.5,31.5,32.5,33.5,34.5,35.5,36.5 mm |
| Material claim | Alloy steel |
| Retail model/part | WBR647 |
| Pack contents | 1 handheld driver and 13 dies |
Check the working requirements
Groove engagement
Confirm the exact back profile as well as its diameter before choosing a die.
Replacement use
Check the driver-to-die connection independently if buying for a system you already own.
Limits to keep with the choice
- Die and driver labels do not establish cross-brand interchangeability.
- The listing does not establish OEM status, the KZU/HUAXING manufacturer relationship, fit for every named-brand watch, or a damage-free opening result.
Questions before you choose
When is this more relevant than an adjustable claw wrench?
When a matching circular grooved die is the contact format you need. The three-point wrench instead adjusts separate claws to the back’s engagement points.
Will this kit fit my Rolex or Tudor?
The seller names those brands, but no individual model fit is established here. Match the back’s actual diameter, groove profile and contact geometry; the thirteen size labels alone are insufficient.
Will these dies fit another numbered opening system?
Cross-brand receiving dimensions are not established. The listing mixes 5537 and 5337 wording, so the actual connection needs confirmation.
Guides for this choice
Alternatives for a comparable task
Selected listing descriptions, specifications and source images were compared for this reference. No hands-on trial is claimed. Product identifier: B0F3GSBZBJ.