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Park Tool TNS-1 Threadless Nut Setter
The Threadless Nut Setter is used to install the star flanged nut found on 1" and 1-1/8" threadless headset systems. Thread the nut onto the TNS, insert into the fork stack, and tap it in with a hammer. Sets the star flanged nut to 15mm and keeps it straight. Long handle helps prevent pinched fingers.
Note: Star nuts not included