it was easy to fit into an old victorian door. with some brass handles and a euro lock that is a knob on the inside i have reduced security as someone could break the wondow to open the door. however i marked it down a little because some times it taks two turns to lock or unlock it, with no predictable formula, so you do need to turn till it atops to be sure. also, probably connected to the above, the knob with refuse to tuen sometimes, it needs to jig feom tue key on the otherside to free up movement. if thats the fault of the euro lock or the sash casement i dont know.