Heavy duty for extra strength, exceeds strength requirements of ANSI/BHMA A156.2-299All metal parts are plated prior to assembly to enhance rust resistancePatented bearing design eliminates metal to metal contact for smooth, quiet operationDesigned for applications with narrow mounting surfaces, such as gates, barn and shed doors, storage bins, and tool boxesDesigned for 2x4 or 4x4 post applicationsDesigned for full or half surface applicationsOffset screw holes for extra strength and to prevent wood from splittingManufactured from steel