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Black (25.4mm) Fits: 22.2mm Post
Black (31.8mm) Fits: 27.2mm Post
Black (34.9mm) Fits: 31.6mm Post (Depending on Frame)
The Box Two Fixed Seat Clamp is made from 6061-T6 aluminum and is cold forged for maximum strength. Box makes them in a handful of sizes to fit many bike frames.