Flare Nut Wrench 10mm X 12mm CFNW1012M Carlyle. Part Number CFNW1012M. Title 10mm x 12mm Flare Nut Wrench. Sizes; 9, x1mm 10 x 12mm 13x 14mm 15x 17mm 16 x18mm. 15 degree offset dual open end. High visibility colour filled size mark for easy identification during use.