Product details PDF Print SKU: cr500 Add to Compare Back to: Corbin/Russwin ×Close Corbin/Russwin Since 1839, Corbin Russwin has been a leader in high-quality commercial grade hardware targeted at commercial and institutional facilities. http://www.corbinrusswin.com/en/site/corbin-russwin/ Description 500 SeriesFeatures: Single Acting Handed Sized Spring (1-4) How to Identify: The Model 500 series spring size will be identifiable by the number stamped on the plug near the shaft.