The Kirkpatrick 1550 Door Knob on Rose Black Antique has a classic oval shape, giving it fantastic ergonomics - it sits very comfortably into the palm of the hand. The door knob is made from malleable iron and has a black antique finish. Matching Accessories for the 1550 Door Knob Please note – when purchasing locks and latches to us with this knob we recommend that they have backsets no smaller than 82mm (with a 102mm case) to accommodate the size of the door knob. Larger sizes can be used to allow clearance of decorative edging on the door.  An appropriate h...