Quick-lift quick-release lever. Special smooth design to avoid any leg interaction. Lightweight and durable 6061 T6 aluminum construction, for aluminum seatposts. Available Diameters: 28.6, 31.8 and 34.9 mm. BBB was created in 1999, in the Netherlands, by two passionate cyclists; Chris Koppert and Frank Moons. 

They had a vision of creating a value for money aftermarket component manufacturing company for their beloved bicycle industry.  Since then, this vision has expanded to 40 countries, 40 categories of bicycles products and over 1500 unique products.  BBB now employs a team of fanatically dedicated product research and development people, plus in-house marketing, packaging and website designers.