The Lock Collar is light weight, strong & easy to use. Simply slide over any olympic or standard size bar & push down to lock tight. The Lock Collar – a quick release weight collar has fast become the weight collar of choice. It’s unique features make it a perfect fit for home, gym, school and club use. Lock Collars are one of the easiest collars to use, slides onto the bar smoothly & locks into place with harming the bar.