The Knob Patented Door Knob Combination Lock Security Cover

A clever vintage security device — “The Knob” by First Security Enterprises, LLC of Dallas, Texas (Patent No. 4561271). This combination lock cover fits directly over any standard round door knob, preventing it from being turned from the outside without the correct 3-digit combination. The combination is fully resettable per the included instructions. A great travel security item for hotel rooms, dorm rooms, Airbnb stays, or any situation where you want extra door security without installing hardware. Includes the original box and instruction sheet.