Pacific Drums & Percussion's PDAX9210 is a closed fixed hi-hat rod that allows you to mount a secondary / auxilliary hi-hat to your drum kit. It attaches to any rod from 10.5mm to 1/2" (~13 mm) in diameter. Includes a Quick Grip clamp with infinite angle adjustment, a bottom cymbal seat, a hi-hat clutch for the top hi-hat cymbal, and a DW boom arm memory lock.