Unfinished Yellow Birch Flooring - 2nd GradeUnfinished Yellow Birch Flooring 2nd Grade Solid Hardwood Bring natural character and finishing flexibility to your project with unfinished yellow birch flooring in a practical 2nd grade selection. This solid hardwood floor features a 3. 25 inch width, random lengths from 10 to 78 inches, a tongue and groove profile, and a nail down installation format, making it a dependable choice for residential spaces where you want the look of real wood with a