Park Tool 3-Way Internal Nipple Wrench - SW-15 The innovative 3-way Y wrench featuring 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.