one collar has springs, the other one is missing them. they both clamp onto bars fine.
Marcy 6 ft. Two-Piece Standard Weight Bar with Threaded Spin Lock Collars for 1-inch Weight Plates Free Weights Accessory for Home Gym TRB-72.2
2-Piece Super Curl Bar with Spin Lock Collars for Home Gym Free Weights
Olympic Barbell “Spin-Lock” Collars (rare,vintage)
20 Pack Dumbbell Collars Rubber Washer Replacement 25mm x 35mm x 3mm 1" Flat O-Rings Non Spinning Stoppers for Barbell 25mm Spin-Lock Screw Nut Dumbbell Handles Adjustable Dumbbells Bar
