Our Knob Latch Set combines the classic style of a Suffolk thumb latch with a convenient knob. Made of cast iron, with a weather-resistant powdered coating, it is suited for period-authentic restoration or a splash of vintage style, inside or out. Comes complete with mounting hardware and installation instructions.Please note: this set will not work on doors pre-drilled with a 2 1/8" bore. Dimensions: 2 7/8" H x 4 5/8" W. Projection: 15/8". Doorknobs: 1 3/4" D. Rosettes: 1 1/4" D. Catch: 2 1/4" W x 1" H x 3/16" Thick. Fasteners: #4 and #8 wood screws. Backset: 3 1/2". Standard door range: 3/4" to 1 3/4" thick.