Last Knock - A "No Soliciting" Sign That Actually Works! (Brushed Silver) Sign Purchase Includes Last Knock Reporting Services At No Additional Cost. All Last Knock Signs Are 3.5 X 1.25 Inches. Laser Engraved. Resistant To Sun Fading, Cracking, And Other Climate Related Conditions. Mild Adhesive Strip On The Back Of The Sign For Easy Attachment.