I bought 2 pairs of these locks, keyed alike, one pair thumb turn and one pair Euro double. These CISA Aslral S locks are the ‘Ferrari’ of Euro Locks, - they are made in Italy. When you see them in your hand and feel the mechanism they are truly well engineered and worth the cost both for their engineering, security, 10 pin cylinder and ease of fitting but most importantly for their safety design – the lock can be opened from the outside even when a key is still in place on the inside. To me this is a very important feature as I had an experience where my mother took a ‘stroke’ and we could see her through the laminated glass lounge window but could not get in until the Fire Brigade arrived, -seconds do count. Enough said, so I would not fit any other make of lock now.