This innovative 3 way y wrench features three different sized wrenches to fit internal spoke nipplesfeaturing a square drive44 plus 5 and 55 mm hexes that slip perfectly into the tight surroundings of most rimsthe sw 15 works on wheels made by numerous manufacturers including44 but not limited to fsa44 blackwell44 planet x44 hed44 rolf44 bontrager44 campagnolo and mavicnote wheel manufacturer specifications can change without notice