These straight leg push-buttons are used to make collapsible polypro and HDPE hoops. They fit 5/8", 11/16" and 3/4" tubing (insert material as small as 1/2" OD and as large as 5/8" OD). 

Buy 10 & save 11%
Buy 25 & save 21%
Buy 50 & save 32%
Buy 100 & save 42%
Buy 200 & save 53%