Specification:Material: Heavy Duty Steel Technology: electrophoresis black finishThick: 2mm and 4mmIt will hold between 100 and 220 lbs when it is opened.Space Saving, perfect for your projects.The top rises up 11.61" and forward 6.46"The bottom section that attaches to the side is 7.09" (approx. 180mm).The top that attaches to the platform can be raised is 6.46" (approx.164mm).No instruction is included. Customers need to install them by your own.Package included:2 * Hinges 2 * Buit-in Gas HydraulicsKindly Remind:Pls note keep this item locked as pic 2 shown when testing the bearing.Due to different measuring tool and ways, pls understand there may be slight measurement deviation about the datas shown.