NMC OSHA sign is the perfect way to alert your employees and guests when a hazard is present in your facility These OSHA signs comply with OSHA 29 CFR 1910.145. Legend "DANGER". Rigid plastic 0.050 thick polystyrene material is ideal for long lasting indoor or outdoor use. Signs are supplied with radius corners and pre-drilled corner mounting holes. Mounting: yes. Good chemical resistance. Maximum temperature: 183 degrees F. Measures 28-inches length by 20-inches height.