These house numbers are machined from 1/4" marine-grade HDPE plastic that can withstand all weather. The numbers are 5 - 5.2 inches tall*, the width varies per number, up to 3.5 inches. Letter widths vary from .5 inch for the letter I to 5.9 inches for the W. The “No” is 8.75 inches total wide without the period next to it. The period will add 1.75 inches next to it. Each number automatically includes 2 (1/4 inch) spacers or stand offs of the same material and 2 matching screws, 1.25 inch long, that are countersunk to be flush with the surface. Note: HDPE needs to be flame treated for glue to stick. *If you want NO HOLES in them and a flush mount, leave a note in the cart “no holes” and I omit those and will automatically flame treat them. You can use a 100% silicone glue or permanent double sided tape. *Numbers have a cap height of the listed size, but some numbers may be slightly taller because of the way this font is designed. A number 1 is the exact height listed but numbers with curves on the top and/or bottom like the 2, or 8 will be slightly taller in order for the numbers to look proportionate. This is not a defect, but a design technique. The 8,3,0 are tallest at 5.2