Spira Brass traditional style Regency Knocker Letter Plate made from solid brass material and a contemporary smooth finish addition to a strong double spring action to avoid plate movement will enhance any solid wood exterior doors with their elegant and sturdy look. Finish: Satin Chrome Dimensions: - External Dimensions: 255mm x 76mm -Internal Dimensions: 195mm x 43mm - Thickness: 7mm - Distance between screw hole centres: 224mm Supplied in singles complete with fixings We do not recommend pre cutting of doors as sizes are approximate and may differ from those shown