Here’s what you need to know about them:

How They Work:

• Operation: Like standard casement handles, turning the handle engages the window’s locking mechanism (usually an espag rod system with multiple locking points along the frame).
• Locking: The key cylinder is integrated into the handle. When the key is turned, it throws a small bolt or engages a block that prevents the handle from being rotated. This secures the multi-point locking system in the engaged position, making it much harder to open the window from the outside.

Benefits of Casement Handles with Keys:

• Enhanced Security: The key provides an additional barrier against forced entry, offering greater peace of mind.  
• Child Safety: Locking the handle can prevent children from opening windows and potentially falling out.
• Ventilation with Security: You can often slightly open the window for ventilation and then lock the handle with the key in that position (depending on the handle design).
• Deterrent: The visible key cylinder can act as a deterrent to potential intruders.