Park Tool SW-40 Four-Sided Spoke Wrench The Park Tool SW-40 features a unique four- sided design with extra strength and support which helps to prevent slipping and deformation of aluminum nipples. Features Sized for 0.127" (3.23mm) nipples Related Articles: WHEEL AND RIM TRUING Manufacturer's Part No: SW-40 UPC: 763477007476 | Park Tool SW-40 Four-Sided Spoke Wrench SW-40, Black, 3.2mm