Here’s a breakdown of what this typically entails:

• UPVC Door: The door material is Unplasticized Polyvinyl Chloride, a common and durable material for modern doors.
• Double Handles: This usually means there are two handles, one on the exterior and one on the interior of the door. These handles are connected to the multi-point locking mechanism within the door.
• Oneside Key: This signifies that the key cylinder is only accessible from one side of the door, which is almost always the exterior for security. There will be no keyhole on the interior handle.

How this type of lock typically works on a UPVC door:

1. Multi-point Locking: UPVC doors often have a multi-point locking system. Lifting the handle engages several locking bolts or hooks along the top, bottom, and side of the door into the frame.
2. Key Operation (Exterior): To lock the door from the outside, you usually lift the handle and then turn the key in the cylinder. This secures the multi-point locks. To unlock from the outside, you insert and turn the key, which disengages the multi-point locks, allowing the handle to be pushed down to open the door.
3. Handle Operation (Interior): The interior handle is typically used to open the door from the inside after it has been unlocked with the key from the outside. It might also have a “snib” or button that can be used to temporarily secure the door from the inside, but this usually doesn’t engage all the multi-point locks and isn’t as secure as using the key.