DWSM9212 - 1/2X18 BOOM C-HAT ARM WITH MG-3 USD$ 79.99 Part#: DWSM9212 Item is available. Qty: Previous Product | Next Product DWSM9212 - 1/2X18 BOOM C-HAT ARM WITH MG-3 dwsm9212 - 1/2-inch by 18-inch Boom Arm Closed Hi-Hat to mount off of stand or to replace boom arm in cymbal stand. Includes MG-3.