Jackloc Window Restrictor, White

Product information

The Jackloc restrictor can be fitted to any style of window and window material, including slim line steel. When in place, it will allow the window to open approximately 10cm from the frame. It can be locked with a key for extra security.

Baby & Toddler Safety Type
Locks & Latches
Eligible for International Delivery



We want you to be happy with your purchase. If you're not, depending on the type of product, you can make free returns in the UK via John Lewis shops, Royal Mail, Collect+, or MyHermes. If you need to arrange collection of large or heavy items, call us on 03456 049 049. For international returns queries, call us on +44 1698 545 454. Find out more about returns.

You'll find returns information on your delivery note. Unless faulty, we'd like you to make your return within 90 days of purchase. Exceptions apply to certain products - find out more about our refund policy.

Q & As

Rated 4.6 out of 5 by 10 reviewers.
Rated 4 out of 5 by Peace of mind Have used these to quickly child proof a window rather than for security. Works equally well on wood or pvc. All I would say is that the security screws supplied are impossible to remove so if you're using it as a childproofing device maybe better to use standard screws (not supplied) 23 June 2015
Rated 5 out of 5 by Good for safety and security Bought 1 to try out and am so pleased with it that I'm now about to order some more as I want them on all our upstairs windows. We live in a 3-storey town house and I was worried about our little one climbing up and falling out of the windows. Also, for security, if we go out and forget to close the first floor windows I worry that it's easy to climb up onto our porch and then get in through the window (as our next door neighbours cat has done in the past!). This lock is more expensive than others I've seen online, but it seems to be very good quality and very sturdy, so I'm happy to pay a bit more for a good quality product. So having fitted these primarily for the safety of my little one getting out I'm also happier that it will make the house more secure against anyone being able to get in through open windows. 09 January 2015
Rated 5 out of 5 by Wonderful product We have recently relocated to France, and now live on the 5th floor of an apartment building...I can only try to explain how I would awaken in the middle of the night after having a nightmare about one of my children falling out of the dangerously low and easy to open window (6 and 3 year old adventurous types and a 5 month baby). However, John Lewis delivered fast and without hitch. They were installed very easily, and seem very robust and hard wearing. They do come with their own screws which my husband was unable to use do to their unusual type of head, however, as long as your little ones aren't about to get their own set of screwdrivers out, normal screws have worked fine. I highly recommend this product, they have saved many a sleepless night...fantastic! 09 September 2014
Rated 4 out of 5 by Good safety item The item itself is good and does what it says. I would recommend that you use normal screws and not the safety ones supplied as they are very soft and hard to use. Plus you can never undo them once they are in. 28 January 2014
Rated 5 out of 5 by Easy peasy lemon sqeezey. Delivery to my local Waitrose was speedy and painless. Product did exactly what it described it was going to do. Easy to install. Do note it comes with non return screws (so burglars can't put thier hand through and remove it to gain access, but this does mean when you use them you can't move it!! Pefectly happy. 19 November 2012
Rated 5 out of 5 by Well designed safety device Fitted this product to top hung double glazed window, it is well designed, easy to fit and provides good security with quick release with the key. Ideal for homes with small children. 15 November 2012
Rated 4 out of 5 by Great safety feature, easy to release and looks decent on double glazing Bought this as our 4 year old has recently started opening and peering out of hs upstairs bedroom window. It's easy-ish to fit- the screws cannot be removed so you need to make sure you get it right! They are a bit fiddly with one not quite in right at the moment but probably operator error I suspect rather than manufacturing fault! Easy to release should you want to open the window wider and looks decent enough on white double glazing. Watch where you position it if you have a roller blind that needs to pull down over the top as it'#s quite deep. 15 July 2012
Rated 5 out of 5 by Window locks Very pleased with the window locks. As someone came into the house via an open window I now feel much safer. 28 June 2012
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