8 Sash Jammers White Zinc Cast Alloy Extra Security Locks Sash Blocker for UPVC/PVC Doors and Windows for Home Security

Fantastic product. Takes seconds to fit with a drill and screwdriver. Went round all vulnerable windows making them a lot more secure. Very robust and secure now. Buying another set for my mum's windows. A fairly cheap yet highly effective item but will give me so much more peace of mind.

Would have liked some advise as to best place to install them on the door

Great product, unfortunately couldn’t fit them on back door and top of frame because metal running through it but these are fantastic and well made. Definitely worth the money and investing in for that extra security.

A very simple and effective way in which we can all enhance the security of windows and doors. I have already recommended these to others. As they are white they are discreet as they blend in with our white upvc windows, they are very sturdy and provide extra peace of mind. Great product and great price!

Very happy with these. They have a good 'weight' to them which is reassuring. I bought a pack of 4 from another company and they were significantly lighter than these. Made me also wish I had just bought two packs of 8 and it wouldn't have cost much more. Good, easy to fit and use, low-cost, security item which will deter and prevent break-ins.

Very easy to install, just 2-3 minutes per piece. Other than tools, everything you need included. A very simple and cheap device that is extremely effective in securing those windows and doors from being crow-barred.

Good quality, compact, strong and smooth open- close at very good price. As any of these in the market....you need to penetrate to the steel structure (window or door) to achieve good and secure fixing, using 1.5 mm HSS drill bit and screw not less than 40-50 mm long..!! Otherwise...drilling to upvc ...skin only...not enough to obtain 100% grip..! Particularly for upvc door must use two of these ..even for windows I would recommend that too. Measurements very important for correct height level and away from Glass.Dr Baban

I bought these to replace poor quality plastic ones I'd bought previously but returned. These are very good quality metal catches that are easily installed and to use. They are very handy to apply during the day without the need to physically lock the door which saves a lot of messing about.