Conversion is designed for installing threadless stems on a threaded fork. FEATURES: Steerer Clamp OD 25.4mm, for 1", 28.6mm for 1-1/8 Approximately 25mm rise increase possible if used with spacers Polished Silver finish Quill Insertion Diameter: 25.4mm for 1 1/8" stems and 22.2 for 1" stems Length of clamp area 1-5/8" (41mm) Quill Insertion Diameter: 1"