Professional quality, precision-sized spoke wrenches are hardened and nickel plated for long service. Park Tool Spoke Wrenches are vinyl coated in one of five colors indicating the size at a glance.

Three-sided
Sized for 0.156" (3.96mm) nipples
This size can be found on select Shimano wheels, hub-drive e-bikes, & wheels found on "heavy duty" bikes. Always measure to be sure.