The "Hat Stack" is the simplest and most compact cymbal stacker in TAMA history. It allows you to attach a small diameter cymbal to your hi-hat rod with just a drum key. Also, its tiny size - 25 mm (1") diameter x 40 mm (1. 5") height - doesn't interfere with your setup and is super easy to carry. The Hat Stack is a great new item that can expand your sound without having to purchase additional clamps. *Make sure to position the black plastic nut on the top. If you put it on the bottom, the cymbal could fall.