You will notice that the White Industries fixed cogs are unique when compared against traditional fixed gear cogs.
There is an industry-wide problem with all threaded fixed gear cogs - they have a tendency to strip threads.
To avoid this problem White Industries designed the fixed gear cogs with a spline interface.
Available in sizes 13t - 20t in both 3/32" and 1/8" widths. The cog is designed to be used with a standard English 1.29 x 24 tpi threaded lock ring.
Fitting for derailleur: Single Speed (3/32"")
Material: 8620 steel