DURABLE CONSTRUCTION: 2mm thick Visitors Sign In At Office signs are built from tough ACM (Aluminum Composite Material) which has a thick aluminum outer layer and a durable plastic core. These metal signs outlast plastic and corrugated signs by several years outdoors. EASY INSTALLATION: All signs come with 2 pre-punched and pre-cleared mounting holes for easy installation. Signs mount to U-channel posts, square or round galvanized posts, wooden posts, and chain-link fences. ROUNDED CORNERS: Our signs have rounded corners and burr-free corners for safe handling, longer life and a professional appearance. MADE IN USA: All signs and their components are manufactured in the USA, offering superior construction quality and durability. PACK CONTENTS: Two 18 x 12 inch blue and white signs. SmartSign All Visitors And Vendors Must Sign In At Office Sign - 2 Pack, 18 x 12 inch, 2mm Thick Aluminum Composite, Blue and White