Sized for spoke nipples with 3.96 mm (0.156") wrench flats This size can be found on select Shimano wheels, hub-drive e-bikes, & wheels found on "heavy duty" bikes — always measure to be sure
Sized for spoke nipples with 3.45 mm (0.136") wrench flats This size is often found on most department store bikes, as well as many other low-to-midrange bikes — always measure to be sure
Sized for spoke nipples with 3.23 mm (0.127") wrench flats This size is often found on higher-end bikes Typical compatible nipple brands include DT Swiss, Sapim, Wheelsmith, Pillar, and many others — always measure to be sure