The Hamax fastening Bracket Lockable system provides maximum safety and fits practically all bikes, both with and without luggage carrier. The most flexible fastening system offered in the market fits tube diameters 28-40 mm with flexible to avoid conflict with attachment point of the wire and Distributes the pressure evenly onto the tube.There is built in safety indicators to ensure that the bar is safely attached to the bracket and the quick release system which is easy to assemble.Features: Boxed-product Weight: 499 gSafety indicators to ensure bar is safely attached to the bracket.Fits tube diameters 28-40 mm.