12 in 1 Adjustable Weights Set: Ranging from 11LB to 66LB, with 12 levels of adjustment (11, 16, 21, 26, 31, 36, 41, 46, 51, 56, 61, 66). From strength training to HIIT workouts, Ativafit 66lbs pair adjustable dumbbell set allows for a wide range of exercises to target different muscle groups. Quick Adjustment & Safety Locking:With a simple dial tech way you can easily adjust our adjustable dumbbell set of 2 in just 1 second. This ensures convenience and safety during your workouts, allowing you to focus on your exercises without any worries. High-quality & Durability: With high quality aolly steel materials used in our product, this adjustable dumbbell set ensures durability and long-lasting performance. Ergonomically designed handles provide a comfortable and secure grip during your fitness progress. 90% Space Saving: Compact and perfect for small home gyms or limited workout spaces, saving up to 90% of space compared to traditional dumbbells. Whether you're a beginner or an experienced lifter, the adjustable dumbbell set can be customized to meet your specific needs. What's included: Each package includes adjustable dumbbell set of 2, each weighing 66 lbs, and 2 dumbbell bases. The combined weights totals 132lbs. How to use: 1.While the Dumbbell is resting on the Dumbbell Tray, press and hold the Red Safety Lock to engage the unlocked position. 2.Adjust the weight selector dial as the Safety Lock is held in the unlocked position. Rotate the weight selector dial to start！ Attention:Please ensure the safety lock is completely released to the pop-up position prior to commencing exercise. Failure to release safety lock, may cause plates to become detached and risk injury.