Two things you should consider before buying but lockable window handles:
1. I bought 4 handles and all obtained with different closures. If you buy the handles in stores (but where they are also slightly more expensive) they can be keyed alike received when the seller gives some trouble.
2. I read quite a lot of intrusion protection here. For this, however, you should know: The handles do not constitute effective protection against burglary against common intrusion methods, but mainly a protection against unauthorized opening of the window from the inside! In a consultation with the Criminal Police Advisory Board, I was informed that the common and absolutely overwhelming intrusion method Forcing closed or tilted windows / patio doors is. Whether the window handle this can be closed or not interested in even the semi-professional burglars very little, since the handle in this intrusion methods does not matter. (To open 1. breaking the glass and reach through and 2. crackdown and open when tilted windows) Only two intrusion methods would handle this represent a rudimentary mechanical safety. According to detectives, the most common Einbruchsart but the rapid and relatively low-noise forced open with a large screwdriver or a small pry bar. For purposes of anti-theft I have installed various other mechanical security throughout the house (also available from ABUS or Burg-Wächter). Ua I have a patio door called the. EM3 bolt of Scheffinger installed. When it comes to the topic of "intrusion protection" offer both ABUS and Burg-Wächter to meaningful fuses for doors and windows. The people interested in this topic should also inform customers in this regard, I can only guess.
Conclusion: In my view 5 * because my intended purpose with the handles is fully met, the product is also processed stable and high quality and the price-performance ratio.