this listing consists of a 3 block set. 1 inside corner and 2 outside corners as shown in listing photos inside block is approximately 7 3/4" from top to bottom, dimensions of the transition piece (top) are height 4", depth of 3 1/4". the 2 outside corners are slightly taller with the same depth of 3 1/4" These have fabricated to use with moulding up to 4 3/4", they are much different than the standard home depot block (for $11) in that i've used a colonial 4 1/2" moulding in the tear drop for added detail. These all pine blocks can be either stained, or primed and painted!! I also have the transition block which bridges two pieces of crown as Well as outside corners! These can also be fabricated with standard shaped moulding for any size transition instead of the colonial shape! e-mail me with quantity of each needed and I will create a listing for you.