Alloy Derailleur Clamp Mech Mount Braze-on adapter 31.8mm black Note: This product page is only sold in 31.8mm black size, if you need another size/color, please see "Frequently Asked Questions". About: High quality belt clamps so you can use a strong weld on any frame of the front rack without needing a strong weld in the assembly. Made of high quality aluminum alloy. Durable, light weight, easy to install. The belt clamping width extends the pressure in the clamping area to the seat tube. All tube diameters available in 2 sizes and colors. Specifications: Material: Aluminum alloy Size table: 31.8 mm (length x width x height) 6 * 3.3 * 2 cm / 2.36 * 1.30 * 0.79 inches; Diameter: 31.8mm / 1.25in; 34.9 mm :(L x An x Al) 6 x 3.7 x 2 cm / 2.36 x 1.46 x 0.79 inches; Diameter :34.9 mm / 1.37 inches; The package includes: One-piece front shunt fixture