This garden clip has been upgraded with a larger opening and stronger spring,they are diameter in closed state approx 1/2″,maximum diameter in open state approx 1.2″,can be used with various thickness greenhouse hoops, poles, pipes, or stakes, Such as 1/2″, 3/4″, 1″ pipe.The thicker and stronger spring gives it a stronger grip to hold plant nets, covers or films firmly in place to prevent them from loosening, slipping or being blown away by the wind, even in bad weather such as high winds or rain or snow.