Stylish Silver 'Please Knock Before Entering' - Do Not Disturb Door Hanger Sign. Perfect for businesses, home office, home office, home, corporate, hotel, doctor, dentist, salon, clinic. ENGRAVED - with text and knock icon on front, plain black on reverse. PERFECT SIZE - 145 mm tall x 75 mm wide DURABLE - made from 3mm metallic effect acrylic STYLISH - Impress clients, staff, family and colleagues with this stylish silver 'Knock Before Entering' Do Not Disturb Door Hanger Sign Manufactured in Alnwick, Northumberland, UK. We have a wide range of Do Not Disturb Signs for work use, in the home or as novelty gifts. Please see all of our other listings.