eSynic 10 Pack Window Locks for uPVC Windows – Self-Adhesive Cable Restrictors With Key Lock
Product description
What this is for
If you’re trying to make window openings safer without losing ventilation, a window restrictor is usually the first step. The eSynic 10 Pack Window Locks are designed to limit how far a window can open, which can help reduce the risk of children or pets getting too close to an open gap.
What you get here is a set of window safety locks/limiters that use either self-adhesive backing or a screw-in option (the product description mentions “2 way installation”, including screwing in). There’s also a key lock function mentioned, which is relevant if you want an extra layer of control rather than relying purely on a fixed limit.
Key features (and what they mean in everyday use)
The headline advantage, on paper, is the combination of a cable-style window restrictor and a locking element. Cable window restrictors work by controlling the maximum opening angle, rather than fully preventing opening. That means you can still crack the window for airflow, while keeping the opening to a safer range.
A big practical point is the installation approach. The listing states the locks have an improved adhesive that “doesn’t leave marks” when removed, and stronger holding power compared with traditional adhesives. At the same time, the product is also described as being installable in minutes, either by sticking the rear self-adhesive pad or by atornillarlo (screwing) if you prefer a more traditional fix.
It’s also made of stainless steel (as per the description), which is a sensible material choice for something mounted on or near windows where moisture and weather exposure can be an issue. Again, no one device is perfect, but stainless steel and a key lock tend to be the type of pairing people look for when they’re trying to avoid “quick fixes”.
The pack is for multiple windows: it’s supplied as 10 units, so it’s easier to equip several sashes or rooms without having to buy separately.
One more detail worth noting is that the description says these window cable restrictors are intended for a range of window materials, including uPVC, wood, aluminium, metal and glass. That’s useful if you’re fitting through a whole property, but it also means you should still double-check whether your exact window style and positioning will suit the restrictor setup.
Where it shines
- Child and pet safety with airflow: It limits excessive opening while still allowing ventilation.
- Two installation options: Adhesive first for speed, screw option if you’d rather anchor it more firmly.
- Extra control with a key lock: If you want windows locked in a restricted/open state, the key lock function is the feature that supports that.
- Material that’s built to last: Stainless steel helps with durability and resistance to tampering.
- Multiple fittings in the box: A 10 pack is convenient for multi-room use.
If you’re thinking of practical scenarios, imagine fitting one on a first-floor room window. You could then set it so the window can open just enough for air, but not enough for someone to wedge themselves into the opening. For day-to-day living, that’s the sort of compromise that often works better than fully blocking a window.
The potential limitations (things to watch before buying)
This is where you’ll want to be a bit cautious. The description does explain that it can be installed with adhesive (and says it avoids leaving marks when removed) and that it also supports screwing, but it doesn’t provide specific guidance such as exact dimensions, compatibility with particular window designs, or how the key lock behaves in your exact configuration.
So, it might not be the best choice if: - You need very precise fit for a specific window sash design and you’re worried the restrictor’s position won’t suit. - Your installation surface isn’t suitable for bonding (even “strong adhesive” can underperform if the mounting area is oily, dusty, or irregular). - You’re expecting a solution that completely stops window use. This is about restricting opening, not necessarily sealing it shut.
Also, “works with many window types” is helpful, but it doesn’t guarantee it will be perfect for every frame style. It’s worth checking before committing, especially if you have unusual glazing or hardware layouts.
Usage tips
For the smoothest installation experience, follow a simple approach: clean and dry the window frame area properly before applying the self-adhesive backing. The description highlights quick install and improved adhesive performance, but good surface prep is usually what decides whether adhesives perform at the level the product promises.
If you decide to screw it in, take care to align it so the restrictor sits where it can control opening effectively. Cable restrictors tend to work best when the positioning matches the window’s movement path, so don’t rush the placement.
Finally, after fitting, test opening limits carefully. You want to confirm the window can still ventilate, while preventing excessive opening—especially in rooms where children or pets have access.
Tech specs
- Type: Window safety lock / window opening restrictor
- Material: Stainless steel
- Installation: Self-adhesive or screw-in (2 way installation)
- Pack size: 10
Is it worth it?
A solid pick if you want a straightforward way to limit how far your uPVC (and other material) windows can open, while still allowing ventilation—and you like the idea of a key lock for added control. The stainless steel build and the “improved adhesive” that’s said not to leave marks on removal make it easier to fit and, if needed, adjust later.
You may want to skip it if you’re looking for a fully bespoke solution with guaranteed compatibility for a specific window design, or if you’re expecting the lock to completely prevent opening. In those cases, restrictions and fit can become the deciding factor.
Mini FAQ
Will this stop the window opening completely?
The description points to restricting excessive opening while still allowing ventilation, so it’s designed to limit opening rather than fully block it.
Can I install it without drilling?
The product description states there’s an option that uses a self-adhesive backing, removing the need for drilling or screws—so you can typically install without drilling if the surface suits adhesive.
Is it suitable for uPVC windows?
Yes, the description explicitly mentions uPVC (along with other materials such as wood, aluminium, metal and glass).
Does it include a key lock feature?
Yes, the description mentions a key lock function for an additional security layer.
How many locks come in the box?
It’s a 10 pack, aimed at fitting multiple windows or rooms.