Phoenix Contact MINI COMBICON DFK-MC 3.81mm Panel Feed-Through Terminal Block Headers. MINI COMBICON DFK-MC 3.81mm pitch panel mount feed-through terminal block headers with an outer header plug-in connection, threaded screw mount front panel flange and an internal (rear panel) 2.8mm quick connect solder eyelet. This MINI COMBICON DFK-MC 3.81mm panel mount terminal block header is for use on a panel thickness range of 0.5 to 4mm. For marker labels see stock number ; 648-5508 648-5508 For screwdriver see stock number ; 390-9663 390-9663