lockjaw elite barbell collar for power weight lifting silver lock-jaw lock-jaw elite 2" / 50mm olympic barbell collar, weight: 18 ounces / set your best choice for the most extreme bumper plate workouts and competition, the lock-jaw elite barbell collar is made of a hybrid steel and proprietary thermoset polymer resin. use : crossfit competition, intense bumper plate workouts the lock-jaw elite barbell collar features an easy-to-use design and has been enhanced through a patent pending hybrid steel skeleton. this collar has achieved the goal of the strength of steel and the convenience of resin. the lock-jaw elite barbell collar is the best choice for bumper plate workouts, competition, or other extreme environments. specifications weight 18.0 ounces (0.5 kg per set) dimensions 3.0” h x 3.5” w x 2.0” d material proprietary polymer, rubber and steel color silver u.s. patent #7,513,856 mfg warranty 1-year master carton 32 sets