Weight Collars- Necessary for Safe Barbell Workouts Weight collars are used to safely hold your Dualbells in place on your bar. A must have for safe weightlifting. Made of strong ABS plastic. Easy to slide on, easy push down tab to close and pull up to release. Choose your color to give your workouts a little more style. • Barbell clamps are available in black, blue, green and red These weight collars fit standard 1" diameter bars and are an easy complement to Dualbell. Don't pass up the chance to get these barbell clamps in the same delivery as your Dualbells. Add them to your cart today!