【New】Olympic Barbell & Dumbbell Shaft Collar - 50mm Hole Diameter - 4 Pieces (Hex Screw Fixed Type, with Hex Wrench) These are original collars from Art Kobo, used to secure plates on the shaft. These are new and unused, but there may be slight scratches or marks from storage. Please refrain from purchasing if you are overly concerned about these minor imperfections.