Polished aluminum. For 35mm fork tubes. The classic 2-piece tweak bar of the 60’s and 70’s is back! Lightweight aluminum. Great for extended forks, especially with single brake rotor, to prevent fork twisting/torqueing. Clamps directly around the 35mm exposed fork tubes on all stock or custom bikes. A must-have when building a true retro bike. Note: Must leave enough space to accommodate full spring travel.