NMC OSHA signs are the perfect way to alert your employees and guests when a hazard is present in your facility. Keep your facility safe, buy an OSHA regulated sign today and prevent an accident tomorrow. These OSHA signs comply with OSHA 29 CFR 1910.145. 0.050 thick polystyrene material is ideal for long lasting indoor or outdoor use. Measures 14-inches length by 10-inches height. Indoor/outdoor use. Mounting: yes. Good chemical resistance. Maximum temperature: 183 degrees F. Header "CAUTION" and legend "ONLY AUTHORIZED PERSONNEL ALLOWED IN CONFINED SPACE AREA".