This coupler is made by aluminum extrusion and is equipped withsuperior bearings allowing you to adjust the weight in order to tilt your måvi pro carbon fiber ring/gimbal as a support system while using witha ready rig gs. Features include a removable rubber pad inside the coupler which allows it to fit any tube size or gimbal handle bar that comes witha 25mm to 30mm dia. The re are also threaded holes including 3/8in-16 and 1/4in-20 (4pcs) on the main base to accept a wide range of adapters, grip accessories, cold shoe mount, lights or monitor arm . Etc. (set of 2)