Product Description Seat tube clamp for mounting braze-on front derailleurs. For frames without soldering base. Technical Information:Material:aluminiumOuter Seat Tube Diameter:28.6 mm / 31.8 mm / 34.9 mmManufacturer Numbers:black 28.6 mm:DP0911black 31.8 mm:DP0921black 34.9 mm:DP0931silver 28.6 mm:DP0910silver 31.8 mm:DP0920silver 34.9 mm:DP0930Contents:1 x Problem Solvers front derailleur clamp Manufacturer: Problem Solvers 6400 W 105th St. Bloomington MN 55438 USA info@problemsolversbike.com Distributor: Cosmic Sports GmbH Leyher Straße 47 90763 Fürth Germany info@cosmicsports.de