Robust Metal Construction with Added Protection: This adjustable dumbbell weight set is built from heavy-duty steel plates for exceptional strength and durability. Additionally, the protective polypropylene covers offer increased water and wear resistance, prolonging the longevity and reliability of the workout equipment 12 Weights Switch in Seconds: With just one hand and in one second, effortlessly switch between 12 weight options ranging from 7 lb to 52.5 lb for each adjustable dumbbell by simply twisting the selectorized anti-slip handle. The clear dials of this adjustable dumbbell set make adjustments even more straightforward, ensuring a smooth and convenient experience Accessible Progression: With its wide weight range and thoughtful increments, this 12-in-1 adjustable dumbbell set provides beginners with manageable weight options, preventing sudden spikes in workload. Meanwhile, advanced trainers can utilize it to perfect their form and technique during daily full-body strength training sessions 2-Step Weight Locking Mechanism: This set of 2 adjustable dumbbell weights prioritizes your safety with a dual locking system for weight plates. This design enhances stability, balance, and overall safety during workouts. Plus, the weight adjustment function is activated exclusively when the dumbbell is securely on the tray, reducing risks of accidental operation or dropping Anti-slip Handle: This adjustable dumbbell weight set is designed with your comfort and control in mind, featuring 1.5" diameter handles with anti-slip convex textures. Crafted from a combination of durable PPR and ABS materials, this pair of adjustable dumbbells enhances grip strength and improves comfort over time About Weight Adjustment: To adjust the dumbbell weight, fully insert the handle into the base (in the lowest position) before turning it. Align the red arrows with the numbers on both dials until you hear a "click-clack" sound, confirming the adjustment. If the red arrows aren't aligned, reset the handle and adjust it again