These are hand cut to order from pine and are usually shipped out within 2 business days. The backboard is 5 1/4" wide with 4 inch numbers glued in place, the ends are rounded and the edges are routed. They are lightly sanded and ready to paint. They will mount easily to most any mailbox pole. In the picture above the pole is sandwiched between the two address signs. For mounting on the house you can use screws ( wood or concrete) or use exterior caulk to hold in place. Finishing Tip: Paint the whole piece the background color. When that dries lightly sand the face of the numbers and finish the faces with the contrasting color. Seal with a clear exterior sealer. Shipping is free. If you have any questions please convo me. Wholesale inquiries are welcomed. Please provide the numbers you need on the sign at checkout. Backboard lengths 2 numbers 10 in, 3 numbers 14 in, 4 numbers 19 in and 5 numbers 24 in.