The Olympic Barbell Lock Jaw Collar are made of durable aircraft grade aluminum, stainless steel pins, and a tough nylon resin lever. These Olympic Collars have a low profile at 1.5 inches wide to allow you to easily add the maximum weight capacity to your Olympic barbell sleeve. The quick release lock makes it easy to put the collars on and take them off the Olympic sleeve. Meanwhile, the power of the same lock ensures your weights are securely on the Olympic bar. In addition, the built-in magnet allows you to easily store the clips on your squat rack, cage, and more. DETAILS: Quality steel construction Allows for fast weight plate changes Includes two olympic barbell collars Magnetic for easy storage on steel weight racks 2-year limited warranty