• Strength tested

    Can hold a force of up to 3,600 newtons

  • Removable cable

    Cable can be removed when not in use

  • Secure

    Two five disc locking barrels to prevent tampering

About the Pro-5 Duo Key Lockable Window Safety Lock

The Pro-5 Duo by Jackloc Window Safety Lock is a key locking window cable restrictor. It provides security against entry through windows and safety against falls, while still allowing the window to be opened up to 100mm.

The double locking system allows for the cable to removed from either side, or removed completely when not required.

The restrictor can fit most window and door sizes and types, including uPVC, Timber and Aluminium.

The Pro-5 Duo window safety lock is incredibly strong and suitable for domestic and commercial settings. It has a reinforced cable, security screws and heavy-weight body. Each Jackloc product is individually tested in the manufacturing process to hold a force of 3,600 newtons, exceeding all relevant standard requirements. The product comes with four hardened and zinc coated grade four security screws to prevent falls and help keep homes safe.

The key allows the window to be fully opened if required.

  • Standard cable length of 200mm
  • Patented five-disc locking barrel
  • Supplied with 1 x Key and 4 x security screws
  • Fitting instructions 

All Jackloc products are tested to the highest standards and have won many awards.

Take a look at our full range of window safety locks 

Instructions coming soon...

Pro-5 Duo Key Lockable Window Safety Lock

(3 customer reviews)


Bulk order?

Bulk Order

If you're looking to place a commercial order or buy in large quantities please enquire below for a tailored quote.

Quantity (max. 12)


If you're looking to place a commercial order or buy in large quantities please enquire below for a tailored quote.

UK and Ireland deliveries take between 1 - 5 days. For purchases outside of the UK and Ireland, please contact us for a full quotation.

3 reviews for Pro-5 Duo Key Lockable Window Safety Lock

  1. Sonja

    Purchased 2 Jackloc pro duos to ensure my upstairs windows are safe for my grandson have not fitted them as yet. Website is easy to navigate, communication good and swift delivery 😊

  2. Gaynor

    I feel far safer with this added on my patio doors.

  3. Mark Fletcher

    Donna at Jackloc quickly sorted out a non-standard order for me for two Pro5 Duos. She was VERY helpful and the order was made at 1pm one day and received at 11am the next day. Superb customer service and a superb product. Thank you Donna.

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Commercial or bulk order?

If you're looking to place a commercial order or buy in large quantities please enquire below for a tailored quote.


For commercial/bulk or special purchase product orders Contact Us, call the sales team on 01455 220 616 or request a call-back.

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Jackloc® Commercial Use

  • Strong

    Strength tested to withstand a force of up to 74 stone

  • Made in the UK

    Designed, engineered, manufactured and tested in the UK

  • Award winning

    Winner of Queen's Award for Enterprise: Innovation

Jackloc® For the home

  • Strong

    Can withstand a force of 74 stone

  • Secure

    Made with reinforced steel parts to keep intruders out

  • Made in Britain

    Designed, manufactured and built in the UK

Why Jackloc®

  • Quality driven

    We abide by quality to produce the strongest restrictors in the market

  • Market-leaders

    Window restrictors are our pure focus

  • Proven

    Our restrictors are individually tested to exceed regulations

  • Award-winning

    We have won many awards including the Queen's Award for Innovation and Enterprise