This professional quality, precision-sized spoke wrench is hardened and chrome plated for long service. The SW-0 is sized for 3.22mm (0.127") nipples and fits Wheelsmith, Marwi and DT, Edco as well as other brands of nipples. The SW-1 is for 3.3mm (0.130") nipples. The SW-2 is for 3.45mm (0.136") nipples.