1.it specially use for electric box. 2.good quality but cheap price Hinge 1)black power coating,ZDC hinge,nickel-plating steel shaft 2)used at cabinet,door,window,public equipmentHinge Features:1) Material: zinc alloy2) Finishes: gray chrome and others3) Applications: cabinet ,door,windows etc.4)nickel-plating steel shaft hinge for window and door and electric box hinge and cabinet door hinge