Quick Installation-This bar clamps built-in high-strength spring, quick disassembly, easy to carry, and can be taken at any time and place. ONLY Suitable for 50mm barbell- suitable for 5mm barbell, and each set of barbell clips you buy contains 2pcs. Ultra-fast Fixation- the quick barbell collars is made of polymer material, which can be locked stably at 6 points, with good sensitivity, greatly improving stability and training without fear of injury.