This Gibraltar SC-GRSEMAC Road Series Multi Clamp is perfect for mounting cymbal, tom, or accessory arms with a diameter range from 1/2" (1,27 cm) to 1-1/4" (3,17 cm). It is crafted of a sturdy, black coated metal and offers adjustable angle with grid adjustment. The Multi Clamp fits securely on the end piece of rack tubes with 1.5" (3.81 cm) diameter and makes setting up and adjusting your gear easy.