This pattern, The Light SIlver Grey, is a fly that is a very versatile fly to be used almost any circumstances from dawn to dusk. The 48 mm fly is a very good choice when the river is at normal summer level. Single hook #8 will balance this fly, as well as a double 10/12 or a treble 12/14, however, match your choice of hook size to the fish you are targeting. is to The fly is offered from size 48 mm, 60 mm, 75 mm and 95 mm.