Internal spoke nipples, and the likelihood of them being a proprietary size, are the bane of shop mechanics. While these spoke nipples may allow manufacturers to develop rim designs that save weight, are super aero, and look super clean, truing and tensioning is a nightmare, especially on a recently glued tubular wheel. Still Park Tool recognizes these designs exist, so there must be tools available to service them. The SW-15 Three Way Internal Nipple Wrench covers the sizes used by eight manufacturers (see the list below) meaning it is incredibly useful for every shop or race tech to have one on-hand. The reach of each tool coves most aero rims up to 80mm profile, and the head of each has the smallest diameter possible (and still be strong and capable of dealing with high tension under spoke loads, or frozen spoke nipples.