See pics Threads function fine
Titan Fitness TwistLock Pro Aluminum Barbell Collar Set, 59.5mm-51.5mm Sleeve
Titan Fitness TwistLock Molded Barbell Collar Set, 59.5mm-51.5mm Sleeve
Titan Fitness TwistLock Pro Aluminum Barbell Grey Collar Set, 59.5mm-51.5mm
Titan Fitness TwistLock Pro Aluminum Barbell Red Collar Set, 59.5mm-51.5mm
Pair Vintage York Barbell Collar Lock Set with Dumbell Bar w/ Sleeves
Titan Fitness TwistLock Pro Aluminum Barbell OD Green Collar Set, 59.5mm-51.5mm
