Park Tool TNS-1 Star Nut Setter Tool The Star Nut Setter easily fits 1" and 1-1/8" forks. The Threadless Nut Setter is used to install the star-fangled nut found on Ahead Set(R) and other threadless headset systems. Thread the nut onto the TNS, insert into the fork stack, and tap it in with a hammer. Sets the star-fangled nut to 15mm into the steer tube and keeps it straight for proper threading. Features Heavy and reliable construction Drives star nut into the steer tube with ease Related Articles: Headset Service Star Fangled Nut Installation Manufacturer's Part No: TNS-1UPC: 763477008008 | Park Tool | Tns-1 Star Nut Setter For 1" & 1-1/8" Threadless Headsets