Our SOP;
PF: "Flaps 18"
PNF: "Speed checked"...pause..."Flaps"...(say slowly and grab handle to confirm flap lever and select)..."18"
PNF: "Flaps 18 set" once actually set
On taxi out we adopt a different procedure. PF calls "Select flaps". PNF does the same routine as above stating the flaps as per takeoff data card. Primary reason is to cross check flap setting and to make you think about what you are selecting for t/o. This because on regular occasions we takeoff with landing (!) flap set as well.