The Sunny Health and Fitness Ob-20 Olympic Dumbbell with Locking Ring Collars will help take your strength training to the next level! It has a weight capacity of up to 150 lb to allow for linear progressive strength gains. The rotating sleeves release torque created by the weight and movement making it safer on the joints. The locking ring collars will secure the weights in place to make working out safer. Get two and perform dumbbell chest presses, shoulder presses, and use just one to perform triceps kickbacks and single arm bicep curls.