Bought these a few years ago to replace Ethos-brand locking collars. At first they were great, easy to slide on the sleeves and locked well when I was doing CrossFit lifts and dropping weight from overhead. They gripped well on the sleeves of the Ethos barbell I have and the Fringe Midas EZ Curl, but the ribbing on the sleeves of my Texas Power Bar make them lose functionality entirely. If the barbell sleeve isn't entirely smooth, they won't grip and can be pulled off even in fully locked mode. Bummer.
Performance
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