NOTE 1: The last three numbers in the product name always indicates the maximum sole width box gutter the rainhead can be fitted to 

NOTE 2: The "length" of the rainhead is it's effective total depth off the wall once installed i.e how far it actually projects from the wall

NOTE 3: The R-300-xxx series have the same height and length as a standard R-300 but have been stretched horizontally in a range of widths.  This allows a much lower profile rainhead to be fitted to a wider box gutter than might otherwise be the case. 

NOTE 4: These are the external finished dimensions of the products.