concealed door closer 1,material: aluminium 2,color: aluminium ... : 20-90 1, Item name: Concealed Door closer2, Item number: VW-DC-K693, Type: concealed door closer4, Material: Aluminium5, Body ... ’s technology data picture:18,Installation sketch map of concealed door closer19,Latching speed adjustment and Closing speed adjustment ... stop function ( 90°pitch ) and (180°without pitch ) concealed door closer