Our push buttons have been sourced with hula hoops in mind. We have the lowest-mass, most-ideal push buttons for Polypro & HDPE hoop connections. These are smaller than many of the big bulky, obtrusive push-buttons that some hoop makers use. Typically used in conjunction with rivets.
The *ideal* drill bit size to use for these buttons is a "Wire Gauge 9" size which is 0.196" in decimal size (product ID 28765A59 at mcmaster.com) ..but a standard 7/32" bit will also work