Cymbal boom arm stand disappearing type VERY long for drum kit

A disappearing type cymbal boom arm. Quite lengthy at 16 and 18 inches approx respect for the main and boom posts respectively.
Felts all there with a plastic type wingnut that doubles as a cymbal protector. Disappearing boom stands can either be used in the conventional way or the cymbal arm retracts into the main post which is handy if you want a straight upright and is also good for packing away efficiently.
and bid buy in confidence.