"Danger - Electrical Room, No Storage Permitted" Sign By SmartSign | 7" x 10" 3M Reflective Aluminum Lyle Signs supplies your sign with radius corners for safety and holes punched one in each corner for easy installation Lyle Safety signs meet OSHA 1910.145 requirements This Lyle Safety sign uses reflective sheeting for night-time visibility This Lyle Safety sign uses reflective sheeting for night-time visibility