The easiest to install door lock ever. Put away the tools and double sided tape, the Door Monkey clamps to the edge of the door in seconds and works with all styles of today's door knobs and lever handles. The unique design also doubles as a pinch guard to help protect little fingers from painful injuries. Unlike other products on the market, the Door Monkey automatically locks when the door is closed and secures the door in a partially cracked position. This allows fresh air to circulate through the secured room, helping to maintain a comfortable temperature when heating and cooling. Adjustable height and easy operation makes the Door Monkey a great solution for kids with younger siblings. The Door Monkey is just as easy to remove and very portable, perfect for those trips to grandma's house. No other product on the market offers the simplicity or versatility of the Door Monkey. Works great for pets too. The Door Monkey is designed to work with 1-3/8 thick interior doors and standard door frames with rectangular door stop molding (see photos above). Applications with nonstandard door stop molding may require the optional catch (sold separately). For additional information see Seller Help in the company profile for Jordacon Enterprises.