This is a 6" Steel Top-Seat. It measures 44 3/8" long, 6 1/4" wide and 1" tall. It fits 12' round pools as well as 16'x12', 20'x12', & 24'x12' oval pools.
It is important that you know which length of top-seat is needed for your pool. This part is not very common, so please do not order it unless you are certain it will work on your pool.