Grace Design SB-DT-HD-BSW - SpaceBar Decca Tree Kit with HD Clamp (BSW Threads)This classic microphone configuration was developed by Decca Records engineers in the 1950s. The Spacebar Decca Tree configuration provides a simple, precise, and easy to set up solution for this technique. The standard Spacebar Decca Tree comes with three E420 1 meter tubes, an SB SMA 5 8" 27 stand mount adapter and three SB AMH adjustable mic holders. These are configured to provide a 2 meter spacing between left and right microphones and a center