There are two sizes of Overflow Grating that are available:
The 25×25 cm is a one block Overflow Grating that is used for rectangular shaped pools.
The 2×25 cm are small Overflow Grating parts that are assembled together. These parts can be used for curved pools as well as rectangular ones.
Considering the material used the two sizes of are resistant to excessive sun light and chlorinated water.
Sizes & Dimension