Lightweight, Unbreakable and unalterable Easy to install Withstands extremes of weather Insensitive to temperature changes Supplied complete with fully adjustable bolts and brackets kit for either wall mounting or for posts (60-90mm die) The kit is robust and tested to withstand winds of up to 183 km/h. Easy to install, allows precise adjustment for optimal positioning. . For use in warehouses, factories, high-risk collision situations, stock surveillance, work station safety and direct observation of hidden parts of machinery, etc., from a safe distance. Viewing distance of 5M, allows viewing from 2 directions An angle of convexity for a field of vision of approximately 90° used at a junctions where users are coming from 2 different directions.