*2"x10" is the "nominal" size of the lumber these brackets are desinged to fit. Typically the actual width of a 2" lumber board is 1-3/4." Gardens To Gro brackets include an inside channel that can accommodate lumber that is up to 1-7/8" wide. 20" high beds are ideal for those who'd rather not stoop. They are also great for wheelchair access. Vegetables and flowers thrive in raised beds. Plus, raised beds deter weeds. Be creative! These corner brackets can be used to make any shape with right angles. Purchase as many sets as you need. It's simple to build a custom raised bed to fit your yard.