Grace Design SB-30/66-BSW - 30cm / 66sm SpaceBar Kit (BSW Threads)Includes (1) 30cm bar, (1) 66cm bar, (1) clamp, (2) standard mic holders and (1) tall mic holder. Available with standard 5 8 27 mic mount threads (most common for USA) or 3 8 16 British Standard Whitworth. Please Note: this kit is supplied with one clamp and is indended to be a single system that you can use with either a 30cm or 66cm bar. To have two complete 30cm and 66cm systems, you need to purchase both individual SB 30 and SB 66 systems.