Concept Adjustable Quick Grip Cymbal Holder. This Adjustable Quick Grip Cymbal Holder from PDP allows you to mount an extra cymbal arm on any 10.5mm to 1/2" rod (13mm) on your hardware setup. This pack ncludes a Quick Grip Clamp for infinite angle adjustment, a cymbal seat with felt pads and a 1/2" rod, and a DW boom arm memory lock.