This is the Sonor MH-AC Series Multi-Clamp. If you are looking for more flexibility with your setup, this add-on offers ultimate maneuverability, unbeatable roadworthiness and an elegant, refined style. The Multi Clamp allows you to mount a cymbal arm or tom arm to another stand with its two adjustable clamps. The MH-AC Multi-Clamp is fitted with the innovative "RPS" Rubber Protection System with soft rubber inserts to prevent dents and scratches on stands. This is German engineering at it's finest. Get it at Drum Center of Portsmouth.