Ifor Williams 250x40 brake drum with a 5 stud on 165.1mm PCD stud pattern.
This is a quality aftermarket product.
Ifor Williams equivalent part number: KS0827
These Hubs will fit trailers from January 1996
Older trailers from between September 1992 and January !996 can also use these Hubs by using adaptor kit IW2569