"Very good tool easy to use well worth the money"verified buyer, 02/22/2024
Dangerfield 'J-Tool' Reach-Through Door Thumbturn Opening Tool
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FREE UK Delivery
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Dangerfield 'J-Tool' Reach-Through Door Thumbturn Opening Tool is backordered and will ship as soon as it is back in stock.
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About This Item
About This Item
Description
Description
A J-tool for authorised thumbturn reach-through work
The Dangerfield J-Tool is a reach-through door tool for suitable double-door gaps and internal thumbturn operation. It is a locksmith tool for authorised non-destructive entry where the door and lock layout allow the method.

"The tool is well made"verified buyer, 11/14/2022
Buy this when the door gap gives access to the thumbturn
Some commercial double doors leave a narrow route to the internal thumbturn. A shaped reach-through tool lets a trained user operate the thumbturn without attacking the cylinder.
Reach-through method
Designed for suitable gaps between double doors.
Thumbturn focus
Targets the internal thumbturn rather than the keyway.
Non-destructive route
Useful when authorised access can be achieved without drilling or pulling.

How to assess the door first
Check the door gap, thumbturn position, and authorisation before using the tool. Work slowly so the tool does not scratch surfaces or bind in the gap.
- Confirm the gap and thumbturn layout.
- Work gently to avoid door damage.
- Use only for authorised entry work.
Helpful next step: bypass tools.
What to know before you choose
| Brand | Dangerfield |
| Product type | Reach-through J-tool |
| Method | Thumbturn operation |
| Door focus | Suitable double-door gaps |
| Best use | Authorised non-destructive entry |
Use lock picking and entry tools responsibly, only on locks you own or have permission to work on, and check local laws before buying.
Quick answers
Is it for every door?
No. The gap and thumbturn layout must be suitable.
Does it pick the lock?
No. It operates the thumbturn where access is possible.
Who should use it?
Trained users handling authorised door entry.
What should I protect?
Avoid scratching doors, frames, or hardware while working.
Add a non-destructive thumbturn route
For the right door layout, a J-tool can avoid unnecessary cylinder attack.
Payment & Security
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