A double-bass drum must have.

The DW Drop-Lock Hi-Hat Clutch closes hi-hat cymbals without foot pressure, thus allowing you to play closed hats and double bass simultaneously. Disengage and drop the top cymbal by hitting the clutch with a drumstick. Step on the pedal and the DW Drop-Lock Hi-Hat Clutch attaches itself at its original position.

If you play double bass, you need it. Into the cart!