This is an 8" Steel Top-Seat. It measures 44 3/8" long, 8 1/8" wide and 3" tall. It will fit on 12' round pools as well as 16'x12', 20'x12' & 24'x12' oval pools.
This part is not very common. Please be certain that you need a 44 inch top seat before placing an order for this part.