Black iron letterplate dimensions: 9" x 3" 228 x 76mm. Opening 155 x 41mm. This black iron letterplate with the decorative beading along the edge is suitable for smaller slots. The black iron range are lacquered & therefore should not be cleaned with metal polish or abrasive cleaner. Cleaning with soap & water will prolong the product. The black iron finish is suitable for outdoor use. British made.