These original Abloy concealed pattern power transfer units have been available for many years. They are sometimes called lead covers. The Z280 suits standard doors opening to 120°, but doors opening to greater angles up to 180° require the Z281 which has an extra-longer flexible conduit and consequently a longer body which houses it. They are widely used where cable management is required on hinged doors, typically where it is necessary to transfer electricity from door frames to door leafs to power access control and electromagnetic door closers. These power transfer units are fitted at the hinge side of the door, and are invisible when the door is in the closed position. Both patterns have a steel casing body and flexible metal conduit in chrome plated finish. If the distance from hinge pin to door frame is more than 20mm, the Z281 should be used. Not for use on centrally pivoted doors.