... :Friction stay, window hinge,friction hinge,window hardware,four bar hinge,hinge,window accessory,window fitting,handleMaterial:SS304#,SS301#, ... SS201#,430#,Groove form:Square groove or round grooveGroove with:22mm ,18mm,15mm,13.5mm Length:6",8",10",12 ... ",20",22",24",26",28",30",32",34",36".Bar thickness:2.0mm,2.5mm,3.0mm.Opening angle: ... carton. heavy-duty friction hinge,window friction stay,bar hinge