Some pin-on hooks have one sharp prong, While Other people have two. Some even have 4 prongs. The four-pronged procedure helps make pleats in normal curtains that would not have pleats woven in the header. It's well worth mentioning that pocket curtains can nonetheless be hooked up into a rod https://angeloclsbh.alltdesign.com/what-type-of-curtain-hooks-do-i-need-things-to-know-before-you-buy-49176164