Park Tool’s innovative 3-way Y wrench features three different sized wrenches to fit internal spoke nipples. Featuring a 3.2mm square drive plus 5mm and 5.5mm hex sockets that slip perfectly into the tight surroundings of most rims. The SW-15 works with wheels made by numerous manufacturers including but not limited to FSA Blackwell Planet-X HED Rolf Bontrager Campagnolo and Mavic. Note Wheel manufacturers specifications change without notice.