WSD standard low profile ski poles baskets black pair 2 inches New WSD standard low profile ski poles baskets black pair 2inches New fit all WSD ski poles actual item pictures brand new pair These are attached by threaded holes Fit all WSD adult ski poles outer diameter of baskets about 2 inches - 50mm, inner diameter of the hole-13mm inside treaded smooth half way down with a smaller lower ring diameter of 13mm threaded You just screw them on ( they screw on baskets no need for pins etc) and they stay on simply as that they do fit all the WSD ski poles as well as whisper and maverick ski poles that we sale if you need any extra baskets Make sure to screw them on all the way up or you taking chance of losing your baskets.These baskets may screw into many other conventional ski poles, walking/hiking poles. We do not know all ski poles that are out there so we have no way to promise fit!