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The plastic sleeves make them easy to grip even with sweaty hands, and they clamp down tight enough that I never worry about the plates shifting mid-set. Locking them on takes maybe two seconds each, which is exactly what I want between exercises.
These spring collars get the job done without any fuss. The plastic sleeves are comfortable on the hands and the squeeze-on action is smooth, locking tight on my standard bar every time. Exactly what I needed for a secure workout.