The Hercules DS513BB Stand comes stock with 2 Trumpet / 1 Flugal Peg.
It is nice to have this additional Trumpet/Cornet Peg so I can have a Bb/C/Eb trumpet all on same stand if I am not using a flugal :)
Note that there is more threading for this DS501B Trumpet/Cornet Peg than there are on the original Pegs which come with the Hercules DS513BB Stand but there is an included nut so you will not have any issues and this Peg will fit into your current/older version of the Hercules DS513BB Stand.
Well, first you have to have a base stand. I have tha alto/soprano sax stand and wanted this peg for my trumpet. Fits perfectly on the stand and holds my pocket trumpet perfectly.