KEEP YOUR PLATES IN PLACE WITH THE WEIDER 1 IN. SPRING LOCK COLLARS.No one likes their plates shifting on the bar, it's annoying and can turn into a dangerous situation if one slides off. Stay safe during your workouts with the Weider 1 in. Spring Lock Collars. These collars fit your standard barbell bar, and the easy-grip design offers easy use. FEATURESIncludes two 1 in. spring lock collarsFits 1 in. standard barbell barEasy-grip design offers a comfortable use