Features: The APM 511BG bass trombone lyre is brass with a goldtone finish, and the clamp measures 3/4" in diameter when fully closed. Sturdy all-metal construction, and it"s made with pride in the USA! The APM511BG will fit many models of bass trombones and tenor trombones with large shanks. Also available: the APM 511TG lyre for tenor trombones. The clip and stem are the same as the 511BG, but it has a smaller clamp. See related products below. Stem length, including clamp: 8" Clamp diameter, fully closed: 3/4" Model: 511BG Manufacturer: Amplate-AP&M co