The quick and easy-to-use lock and release mechanism, allows for fast plate changes during training. When unlocked, the collars slide seamlessly onto Olympic Bars and securely lock plates into position at the switch of the handle. The Gym Gear Olympic Clamp Collars are manufactured using a strong and durable plastic that can withstand the toughest environments. SPECIFICATION: Brand GymGear Usage Home Use, Commercial Use Condition Brand New Warranty 2 years warranty