Park Tool SW-15 3-Way Internal Nipple Spoke Wrench A nipple driver is a necessity for any wheel builder. They save time and aid in puttong together precision built wheel. The Park Tool sw-15 is built with a comfortable, dual density grip and lined with precision bronze bearings to ensure a long, smooth running life. Features 3. 2mm square drive, with a nominal outside shaft diameter of 6mm 5mm hex socket with a nominal outside shaft diameter of 7. 5mm 5. 5 mm hex socket with a nominal outside shaft diameter of 8mm Slips perfectly into the tight surroundings of most rims Works with numerous manufacturers including: FSA, Blackwell, PLanet-X, HED, Rolf, Bontrager, Campagnolo, and Mavic Related Articles: WHEEL AND RIM TRUING MAVIC COSMIC CARBONE SLR SERVICE Manufacturer's Part No: SW-15 UPC: 763477007292 | Park Tool | Sw-15 Internal Nipple Wrench Sw-15