... per buyers' requirement 5)For single door (1).Name: hidden door closer,concealed door closer.(2).Item number ... 30.5mm thickness ,durable and safe,suitable for single door and window.and can bear the ... :Non-direction demand,Four main valve are design for the optional & different design door ,include the ... smooth ,quiet ,durable operation. *4.Size:suitable for the sigle door ,max door width:1200*2100 ...