Hillman 840205 This Door Must Remain Unlocked During Business Hours Flexible Self Adhesive Sign, Black and White Vinyl, 1.5x28 Inches 1-Sign This Door Must Remain Unlocked During Business Hours Sign designates a door to remain unlocked during business hours. The sign has This Door Must Remain Unlocked During Business Hours text in bold white, against a reflective black background. Sign made of ultra-violet fluorescent ink for maximum visibility from a distance. Measures 1.5 x 28 inches. Made from heat resistant vinyl, a type of material designed for extreme temperatures. Vinyl is extremely flexible, durable and impact resistant. Withstands most environments, and will not fade in extreme temperatures. Self-adhesive backing for easy installation. Sticks effortlessly to most smooth, flat surfaces. Made in USA. This item is sold individually as a single pack, 1-Sign.