Sound Horn Proceed With Caution Sign

- Corrosion-resistant aluminum construction
- Engineer-grade reflective enamel finish
- Highly visible black-on-white lettering
- Pre-drilled mounting holes in all 4 corners
- Size: 12 x 18
- Suitable for indoor and outdoor use
- Heavy duty design
- Mounting hole diameter: 1/8
- Thickness: 0.63