Years ago we took off all our bolt on holds and replaced them with screw on holds. We could not be happier. We keep these holds on as outdoor wooden rock climbing wall for kids. And these handles ensure that even younger kids are able to get the hang of climbing and make it to the top. With screw on holds we never have to worry about spinners, they are quick and easy to put up, and we never have to worry about t-nuts rusting out. I would highly recommend these. We leave them outdoors, year round and they still look and work great after 5 years.