Can I attach the NinjaLock onto doors where the thumb turn is combined with the door knob? カスタマーセンター October 25, 2017 08:25 Updated Follow The NinjaLock can only be attached on thumb turns which are apart from the door knob or handle. Related articles Where can I download the application? Which kinds of doors can the NinjaLock be attached to? Can I attach the NinjaLock onto sliding doors? Can NinjaLock be operated from a tablet? Comments 0 comments Please sign in to leave a comment.