Increase the intensity of your arm workout with the Olympic Dumbbell for all fitness enthusiasts. Rotating sleeves allow the weight plates to rotate as you move the bar. This provides a more secure grip and reduces stress on your wrists and elbows Locking Ring Collars to keep everything secure and in place for stability and safety Diamond knurled handles are comfortable so you're won't shred up your hands while lifting heavier weights. Knurling is optimal for supplementing your own grip strength and helping correct hand placement. Accommodates Olympic weight plates with 2-inch center holes up to a maximum combined weight of 150LBS