General description The UNIOR Star Nut Guide is expertly crafted from premium flex plus carbon steel with a phosphated surface finish, adhering to standard ISO 9717. This guide is specifically designed to assist in the installation of star nuts on 1" and 1-1/8" threadless headset systems, making it an essential tool for both professionals and DIY enthusiasts. Technical specifications Material: Premium flex plus carbon steel Surface finish: Phosphated to standard ISO 9717