HIGHLY VISIBLE WITH EXACT ANSWER: Whether you ' re trying to keep intruders out or invite visitors inside, this unique product will ensures that all who enter know exactly what to expect on other side of the door : This Home Sign Sticker DO NOT need to special tools or drilling to mount it Works on stainless steel, wood cabinet doors and so on EASY TO USE: This green sign, red sign, in use sign has easy glides shutter to display OCCUPIED or VACANT Maximize the use of ALL responsible hands in your home or with it MULTI-APPLICATION: Personalize this sliding sign for medical signs, restroom occupied signs, doctor ' s offices, meeting rooms, hospital emergencies rooms, personnel nameplates or whatever you need NONe SCRATCH: door indicators none scratch to protect room door or other appliances Not need to worry about unexpected scratch to your door