Stair Tread Flat Plates create an attractive, permanent anti-slip surface for interior and exterior steps and landings. Great for worn problem areas, dangerous steps and slip hazards.For use on new or existing wood, concrete, or metal structures Made from heat treated exterior grade aluminum Anti-slip surface is extremely durable, resistant to marring, scratching or chipping Great for indoor or outdoor use Meets and exceeds OSHA and ADA federal specifications