The newest collar in the Lock-Jaw Collar line-up, Lock-Jaw Flex is an excellent collar for all lifts and workouts. Featuring a quick release lock-tab for easy installation and removal, and a MAGNET on each collar for easy storage on rig or rack. Aircraft grade aluminum construction, and rubber pads to protect bar finish. Genuine Lock-Jaw Barbell Collar. Fits all 2" bars. Each unit purchased includes 2 barbell collars.